Rafcon

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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

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- Improvements:

- :issue_ghe:`530` automatically focus and adapt position of root state for fresh initiated state machines
issue title was "Root state out of focus and badly positioned"
- :issue_ghe:`543` Changing default option for library name while saving
-> for the default folder name white space are replaced with underscores and all is lower case
- also default library state name is now the folder name with replaced underscores with white spaces


- Bug Fixes:

- :issue_ghe:`527` RAFCON GUI loops while startup if HOME environment variable is not defined
-> a error message pointing on respective missing environment variable is added
- :issue_ghe:`539` grouping of states outcome transitions are not fully recovers (now bug is covered by test)
- :issue_ghe:`515` source editor does not show end of lines (finally)

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- Improvements:

- :issue_ghe:`529` accelerate the follow mode switch for many logger messages
- dynamic insertion of states during state execution is working and tested
- secure dynamic modification of state machines while runtime by test created in
pull request :issue_ghe:`535` Dynamic insertion of states during execution

- Bug Fixes:

- :issue_ghe:`515` source editor does not show end of lines (partly)
- :issue_ghe:`533` States inside library states cannot be selected
- :issue_ghe:`528` execution history destruction does not lead to max recursion depth