Bump version to 4.2.dev (next development)
Finish 4.1.1

Conflicts:
	open_cobol_ide/__init__.py
Integration of the new splittable tab widget of pyqode.core

(Requires pyqode.core@develop)
Fix segfault when closing the application after a tab has been split

Also improve new split size (do not reuse previous tabs)

THIS REQUIRE TO UPDATE pyqode.core TO THE LATEST commit on the master branch
Fix a circular reference that cause the app destructor from not being called

This needs to be tested on Windows
Fix tests, pyqode does not use a develop branch anymore

(and OpenCobolIDE will also drop it soon, after the next release)
Improve about dialog

Make it a little bigger, fix some typos and center the license text
Merge pull request #75 from OpenCobolIDE/feature/splittable_tab_widget

Add a splittable tab widget to the editor page
Add report bug action
Let the user close the navigation panel

It can be shown by triggering View->Windows->Navigation
Reduce homepage stylesheet to the minimum
Add the new FileSystemTreeView which shows a view of the directory of the
current editor.

You can quickly open files by double clicking any item in the tree view
Don't show the bin folder in the tree view
Add context menu to the treeview:

  - new file/dir
  - copy / copy path
  - cut
  - paste
  - delete
  - rename
Add a way to lock the file system path
Add lock icon for system that do not have an icon theme (windows/mac)
Small improvements to the preferences dialog

- fix misaligned cobol standard combo box
- fix wrong icon from them for the compiler tab
Move autocomplete mode to pyqode.cobol
Rebuild resource script
Small improvements to the control panel stylesheet to looks better on breeze (kde)