Rafcon

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- Features:

- new shortcut open library state separately as state machine by default on 'Shift+Ctrl+Space' (shortcut works for multiple states, too)

- Improvements:

- Provides proper PyCharm config files (in the `.idea` folder)
- update menu item labels
- updated rst documentation

- Bug Fixes:

- recent opened state machine list no more miss paths
- :issue_ghe:`550` Gaphas cairo.Error: invalid value (typically too big) for the size of the input (surface, pattern, etc.)
- :issue_ghe:`564` Zoom onto mouse position
- handle config option `ZOOM_WITH_CTRL` properly

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- Improvements:

- example state machines and generic libraries get now installed via pypi

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- Improvements:

- default config file extended

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- Improvements:

- PYTHONUSERBASE added to search path list for gtk style files

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- Improvements:

- library_manager: increase performance of loading libraries by caching a list of all loaded libraries
- gaphas editor: use new meta data hash method to speed up loading time

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- Improvements:

- the column headers of state machine tree now can be used to sort the items according state name, ID or type
- more user friendly interface for tree and list view widgets e.g. data ports, outcomes and semantic data
-> scrollbar adjustment and selections are moving much less and try to stay in the front of respective widget
- correct tab motion to be more accurate
- execution_history widget shows more visible chars per data port