Move changes in 'NEWS.md' to new unversioned release

Also use backticks instead of single ticks for proper markdown highlighting.
Improve changelog messages by clarifing and properly focusing on the
important changes as well as adding more relevant commit hashes.

Signed-off-by: Maximilian Löffler <s8maloef@stud.uni-saarland>

NEWS.md

@@ -2,24 +2,40 @@
 
 # coronet – Changelog
 
+## unversioned
+
+### Added
+
+- Add issue-based artifact-networks (PR #244, 98a93ee721a293410623aafe46890cfba9d81e72, 771bcc8d961d419b53a1e891e9dc536371f1143b)
+- Add a new `split.data.by.bins` function (not to be confused with a previously existing function that had the same name and was renamed in this context), which splits data based on given activity-based bins (PR #244, ece569ceaf557bb38cd0cfad437b69b30fe8a698, ed5feb214a123b605c9513262f187cfd72b9e1f4)
+
+### Changed/Improved
+
+- Enhance testing data by adding `add_link` and `referenced_by` issue events which connect issues to form edges in issue-based artifact-networks (PR #244, 9f840c040d552e8639aa82c3dd537c189679b348, ea4fe8d3c84f948af6147cf0137e80181ebb7a1e)
+- Add input validation for the `bins` parameter in `split.data.time.based` and `split.data.by.bins` (PR #244, ed0a5302ea8c8934d7200b95be7ac1446305af07, 5e5ecbac44d07927b953ae9d4330a616f8224ba7)
+- Rename `split.data.by.bins` into `split.dataframe.by.bins` as this it what it does (PR #244, ed5feb214a123b605c9513262f187cfd72b9e1f4)
+
+### Fixed
+
+- Reformat `event.info.1` column of issue data according to the <issue-%source-%id> format, if the content of the `event.info.1` field references another issue (PR #244, 62ff9d0f31adbefb3381936237dc4ab984e33acb)
+- Fix an issue in activity-based splitting where elements close to the border of bins might be assigned to the wrong bin. The issue was caused by the usage of `split.data.time.based` inside `split.data.activity.based` to split data into the previously derived bins, when elements close to bin borders share the same timestamps. It was fixed by replacing `split.data.time.based` by `split.data.by.bins` (PR #244, ece569ceaf557bb38cd0cfad437b69b30fe8a698)
+- Remove the last range when using a sliding-window approach and the last range's elements are fully contained in the second last range (PR #244, 48ef4fa685adf6e5d85281e5b90a8ed8f6aeb197)
+- Rename vertex attribute `IssueEvent` to `Issue` in multi-networks, to be consistent with bipartite-networks (PR #244, 26d7b7e9fd6d33d1c0a8a08f19c5c2e30346a3d9)
+
+
 ## 4.3
 
 ### Added
 
 - Add function `verify.data.frame.columns` to check that a dataframe includes all required columns, optionally with a specified datatype (PR #231, d1d9a039f50480ec5b442dc7e8b518648d1f9d9d)
 - Add helper function `is.single.na` to check whether an element is of length 1 and is `NA` (ddff2b8bbca6405f5c7c1cf4e7e97374fb1426ca, ccfc2d12a68dfa412f05159e8e3b03118694e748)
 - Add CI support for GitHub Actions (PR #234, fa1fc4af65751402ae6b23298dd4ed821930c6d2)
-- Add issue-based artifact-networks (PR #244, 98a93ee721a293410623aafe46890cfba9d81e72)
-- (Re)add 'split.data.by.bins' function which splits data based on given activity-based bins (PR #244, ece569ceaf557bb38cd0cfad437b69b30fe8a698)
 
 ### Changed/Improved
 
 - Include structural verification to almost all functions that read dataframes from files or set a dataframe (setter-functions) (PR #231, b7a95881da72ccaa548c6cd5d94bd558a25caa6f)
 - Include removal of empty and deleted users in the setters of mails, commits, issues, and authors. For commits, also the `committer.name` column is now checked for deleted or empty users (PR #235, 08fbd3e11e33d060f42cbc6f729eaf60b48a6de7)
 - Check for empty values (i.e., values of length < 1) when updating configuration attributes and throw an error if a value is empty (9f36c544637ab4f4173408152d223b9b5098ce5a)
-- Enhance testing data by adding 'add_link' and 'referenced_by' issue events which connect issues to form edges in issue-based artifact-networks (PR #244, 9f840c040d552e8639aa82c3dd537c189679b348)
-- Add input validation for the 'bins' parameter in time-, and bin-based splitting (PR #244, ed0a5302ea8c8934d7200b95be7ac1446305af07)
-- Rename 'split.data.by.bins' into 'split.dataframe.by.bins' as this it what it does (PR #244, ed5feb214a123b605c9513262f187cfd72b9e1f4)
 
 ### Fixed
 
@@ -33,10 +49,6 @@
 - Prevent R warnings `In xtfrm.data.frame(x) : cannot xtfrm data frames` (PR #237, c24aee7d8f0b6ff4b641c8922e6ee1dce6f5999c)
 - Fix wrong bracket in pasted logging message (PR #241, 50c68cb60114b49c32dc5be15014745cb8d42ded)
 - Replace deprecated R function calls (PR #237, ed433821c04711a96501887b315d1b0ea8681f5a)
-- Reformat 'event.info.1' column of issue data according to the <issue-%source-%id> format, if the content of the 'event.info.1' field references another issue (PR #244, 62ff9d0f31adbefb3381936237dc4ab984e33acb)
-- Replace time-based splitting as a helper inside activity-based splitting, because of its imprecision, by pure bin-based splitting (see 'split.data.by.bins'). Previously activity-based splitting partitioned data into bins, obtained the timestamps of the elements at the bin borders and did time based splitting. However, elements crossing bin borders can have equal timestamps which causes issues (PR #244, ece569ceaf557bb38cd0cfad437b69b30fe8a698)
-- Remove last range when using a sliding-window approach and the last ranges elements are fully contained in the second last range (PR #244, 48ef4fa685adf6e5d85281e5b90a8ed8f6aeb197)
-- Rename vertex attribute from 'IssueEvent' to 'Issue' in multi-networks to be consistent with bipartite-networks (PR #244, 26d7b7e9fd6d33d1c0a8a08f19c5c2e30346a3d9)
 
 
 ## 4.2