stream_v0.4.0

• optimize marker gene detection
• add function set_workdir()
• add new parameters for command line
• add function add_metadata()
• add support of color range setting for gene plots
• add axis labels for UMAP and tSNE plots
• support removal of figure legends
• add auto detection of branching event for structure adjustment and plotting
• add the support of se for mapping
• add n_neighbors; nb_pct is deprecated
• change default dimension reduction to se;
• change default number of jobs to 1;
• change default value of loess_frac,min_num_cells,min_num_genes