"save as subcorpus" sets the subcorpus but the submit prefers the (equivalent) ad-hoc selected text types

[tomachalek]

How it behaves:

1. user selects some text types
2. user hits "save as subcorpus" button
3. user enters a name and submits the widget
4. now the query form looks like it will query the new subcorpus but the ad-hoc text types are still selected
5. the result applies for the selected text types and not the new subcorpus

• as a side effect, we loose i.p.m.

How it should behave:

1. just like the current behavior
2. "
3. "
4. the new subcorpus is selected and the form for ad-hoc selection is reset and disabled (just like in case user selects some pre-existing subcorpus)
5. the result applies for the new named corpus (and thus contains precalculated i.p.m.)