Thonny

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* FIXED: Backend related regression introduced in b8

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* CHANGED: (FIXED 231) Stop/Reset button is now Interrupt/Reset button (tries to interrupt a running command instead of reseting. Resets if pressed in idle state)
* FIXED 232: Ubuntu showed pip GUI captions with too big font
* FIXED 233: Thonny now remembers which view was on top in a panel.
* FIXED 234: Multiline support problems in shell (trailing whitespace was causing trouble)
* FIXED: pip GUI shows latest version number when there is no stable version.
* FIXED: pip GUI now can handle also packages without PyPI presence
* TECHNICAL: Backends are not sent Reset command for initialization anymore.

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* FIXED: Removed some circular import to support Python 3.4
* FIXED: pip GUI now also lists installed pre-releases
* EXPERIMENTAL: GUI for installing Thonny plug-ins (Tools => Manage plug-ins...)
* TECHNICAL: Thonny+Python bundles again include pip (needed for installing plug-ins)
* TECHNICAL: Refactored creation of several widgets to support theming
* TECHNICAL: THONNY_USER_DIR environment variable can now specify where Thonny stores user data (conf files, default virtual env, ...)

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* ENHANCEMENT: Shell now shows location of external interpreter as welcome text
* FIXED 224: Tab-indentation didn't work if tail of the text was selected and text didn't end with empty line
* FIXED: Tab with selected text occasionally invoked code-completion
* TECHNICAL: Tweaks in Windows console allocation
* TECHNICAL: Thonny+Python bundles don't include pip anymore (venv gets pip via ensurepip)

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* FIXED: Typo in pipGUI (regression introduced in b4)

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* CHANGED: If you want to use Thonny with external Python interpreter, then now you should select python.exe instead of pythonw.exe.
* FIXED 223: Can't interrupt subprocess when Thonny is run via thonny.exe
* FIXED: Private venv didn't find Tcl/Tk in ubuntu (commit 33eabff)
* FIXED: Right-click on editor tabs now also works on macOS.