CalculiX Advanced Environment v0.7

• Weight of the distribution reduced by ~90 MB.
• Now help on CalculiX keywords is opened in the default web browser. Embeded QWebEngineView was removed.
• Improved communication between windows.
• Added support for special symbols in sets and surfaces. Fixed issue 7.
• Settings file format changed to .py
• DEBUG is default logging level. Better debug messages.
• A tool to update and cleanup /doc. Removed over 2200 unused files.
• Logging of error's traceback added
• Test for Path class