Merged with default branch to prepare a new release. maintenance release-20.10

HgDialog: some fine tuning when showing the input area.

HgDialog: fixed an issue handling the returnPressed signal of the input widget.

ConfigurationDialog: fixed an issue resizing the shown configuration page.

Updated Russian translations.

Fixed some code style issues and one coding issue.

Fixed an issue overriding tab and indent settings for Pygments based lexers.

Editor, MiniEditor: fixed an issue dealing with Pygments lexers.

Utilities: optimized and fixed the assembly of version information.

Updated source docu.

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