Remove Prepos after_install permissions hack

`/usr/bin/unzip` is no longer used.  `ditto`
correctly preserves these permissions.
Upgrade QQ.app to v3.1.0
Fix Kuaipan version typo
Merge pull request #3547 from linc01n/fix_version_name

Fix Kuaipan version typo
Merge pull request #3546 from xiaogui/update-qq

Upgrade QQ.app to v3.1.0
Update of JabRef to version 2.10
Merge pull request #3548 from gerstorfer/patch-1

Update of JabRef to version 2.10
cut v0.31.0
Merge pull request #3501 from rolandwalker/remove_prepos_hack

HOLD until next release: Remove Prepos after_install permissions hack