Thonny

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* FIXED 303: Allow specifying same interpreter for backend as frontend uses
* FIXED 304: Allow specifying backend interpreter by relative path
* FIXED 312: Closing unsaved tab causes error
* FIXED 319: Linux install script needs quoting around the path(s)
* FIXED 320: Install gets recursive if trying to install within extracted tarball
* FIXED 321: Linux installer fails if invoked with relative, local user path
* FIXED 334: init.tcl not found (Better control over back-end environment variables)
* FIXED 343: Thonny now also works with jedi 0.11

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* FIXED 31: Infinite print loop freezes Thonny
* FIXED 285: Previous used interpreters are not shown in options dialog
* FIXED 296: Make it more explicit that pip GUI search box needs exact package name
* FIXED 298: Python crashes keep backend hanging
* FIXED 305: Variables table doesn't get updated, if it's blocked by another view

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* NEW: More flexibility for classroom setups (see https://bitbucket.org/plas/thonny/wiki/ClassroomSetup)
* FIXED 276: Copy with Ctrl+C causes bell
* FIXED 277: Triple-quoted strings keep keyword coloring
* FIXED 278: Paste in shell causes bell
* FIXED 281: Wrong unindentation with SHIFT+TAB when last line does not end with linebreak
* FIXED 283: backend.log path doesn't take THONNY_USER_DIR into account
* FIXED 284: Internal error when saving to a read-only folder/file (now proposes to choose another name)

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* FIXED 273: Memory leak in editor margin because of undo log
* FIXED 275: Updating line numbers is very inefficient
* FIXED: Pasted text occasionally was hidden below bottom edge of the editor
* FIXED: sys.exit() didn't really close the backend

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* ENHANCEMENT: Code completion with Tab-key is now optional (see Tools => Options => Editor)
* ENHANCEMENT: Clicking on the editor now closes code completion box
* CHANGED: Code completion box doesn't offer names starting with double underscore anymore.
* FIXED: Error caused by too fast typing with open code completions box
* ENHANCEMENT: Find/Replace dialog can now be operated with F3
* ENHANCEMENT: Find/Replace pre-selects previously used search string
* ENHANCEMENT: Find/Replace dialog doesn't block main window anymore
* FIXED: Find/Replace doesn't ignore spaces in search string anymore
* FIXED: Closed views reappeared after restart if they were only views in that notebook
* FIXED 264: Debugger fails with with conditional list comprehension
* FIXED 265: Error when using two word search string in pip GUI
* FIXED 266: Occasional incorrect line numbering
* FIXED 267: Kivy application main window didn't show in Windows
* TECHNICAL: Better diagnostic logging

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* CHANGED: pip GUI now works in read-only mode unless backend is a virtual environment
* FIXED: Error when non-default backend was used without previously generated Thonny-private virtual environment