Fix TypeError exception in db.py on add activities

Fix TypeError exception: tuple indices must be integers, not str.
Do not create new connection for each notification

This typo caused creation of new dbus connection every time a
notification was sent.
renamed function for storing tag autocomplete preferences
fixes #80
Merge pull request #121 from sebastian-leidig/master

corrected function name: set_tags_autocomplete -> update_autocomplete_tags
Merge pull request #119 from tbabej/Fix_typo_bug

Typo notification_conn -> _notification_conn : Do not create new connection for each notification
Merge pull request #112 from msize/patch-2

Fix TypeError exception in db.py on add activities
Fix the bug occurs during addition of activity

Bug occurs after entering '@' sign.
Fix the bug while changing category of an activity

More:
https://github.com/gsobczyk/hamster/issues/15
Merge remote-tracking branch 'projecthamster/master'
possibility to track last activitity in the past
translations
Revert "possibility to track last activitity in the past"

This reverts commit 5cb6a5be94674866bf50f416734f6c9b9ac57c20.
Allow search using the "NOT" keyword
category fallback field
search by NOT keyword fix
Merge remote-tracking branch 'gsobczyk-hamster/master'