Move dmgerman/xournal upstream to current state of upstream on sourceforge#37

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rartino wants to merge 7 commits intodmgerman:upstreamfrom

Commits on Apr 16, 2018

Fix sporadic wrong detection of auto-save restores and creation of randomly named files when opening files from recently opened list
Denis Auroux
committed

Commits on Jun 1, 2018

Install html documentation in docdir/htmldir instead of html-doc
Denis Auroux
committed
Fix: Install html documentation in docdir/htmldir instead of html-doc
Denis Auroux
committed

Commits on Jun 2, 2018

selection resize snaps to preserve aspect ratio
Denis Auroux
committed

Commits on Oct 5, 2018

Updated Italian translation (by Marco Ciampa)
Denis Auroux
committed

Commits on Jun 6, 2019

Added Valencian variant of Catalan translation (Alfredo Boix)
Denis Auroux
committed

Commits on Sep 17, 2019

Fix bug where auto-saves would repeat instantly while user is drawing. Make default auto-save frequency less aggressive.
Denis Auroux
committed