Rafcon

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- Features:

- :issue_ghe:`581` Utility shortcuts to add transitions from selected state to parent default outcome and sibling states

- Improvements:

- redraw graphical editor if connections are removed
- extend German RAFCON translation
- extend Developer's Guide by how-to on translating RAFCON
- API: ``add_state`` is adapting the passed ``state.state_id`` automatically in case of conflicts
instead of raising an ``AttributeError``

- Bug Fixes:

- :issue_ghe:`455` Proportional resizing states now works properly
- :issue_ghe:`538` Many error outputs when changing MAX_VISIBLE_LIBRARY_HIERARCHY
- :issue_ghe:`541` Where are the magnet lines gone?
- :issue_ghe:`551` Prevent RAFCON from restarting if installation of fonts fails
- :issue_ghe:`571` Wrong rendering of scoped variables
- :issue_ghe:`580` update font installation
- :issue_ghe:`584` Opening a external source editor fails for a never set active state machine id
- :issue_ghe:`586` Ungroup of a state with data flows in between of it child states twice in the same hierarchy
creates corrupt state machine or fails
- stepping works inside library and concurrency states
- :issue_ghe:`589` decider state can be deleted
- make i18n work

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- Features:
- new save state machine as menu item for root state right click menu to offer direct 'save as library' operations

- Improvements:

- :issue_ghe:`579` Integrate external execution log viewer


- Bug Fixes:

- :issue_ghe:`574` Group fails if it includes data flows between the grouped states or scoped variables

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- Features:

- maintenance release

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- Bug Fixes:

- fix setup.py, sdist now working on pypi

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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