0.22.4

Fixed:

• Now the result of conflict resolution could be surely written into the storage.
• Deleted files can be handled correctly again in the history dialogue and conflict dialogue.
• Some wrong log messages were fixed.
• Change handling now has become more stable.
• Some event handling became to be safer.

Improved:

• Dumping document information shows conflicts and revisions.
• The timestamp-only differences can be surely cached.
• Timestamp difference detection can be rounded by two seconds.

Refactored:

• A bit of organisation to write the test.