Allow dropping image directly from Google image results.
Fix handling of acoustid network errors
Fix stash-pop generated error

I tested this before a stash but failed to retest it after a stash pop.
Sigh.
Address minor zas comment
Address zas, freso comments
Fix throttle decorator function...

... so that it uses args from last call before timer triggers rather
than args when timer was set.
Address zas comment
Add %_absolutetracknumber% variable...

...so you can number tracks sequentially on multi-track discs without
using a disc number.

See http://forums.musicbrainz.org/viewtopic.php?pid=25326 for
requirement.
Change name to albumtracknumber

to fit better with totalalbumtracks cf. tracknumber and totaltracks
D'oh - should be ~ not _
Address bitmap comment.
Switch back to %_absolutetracknumber%
Fix lyrics tag displays with []
Address final zas comment
Merge pull request #241 from Sophist-UK/sophist_fix_acoustid_webservice_errors

Fix handling of acoustid network errors
Update po/picard.pot
Merge pull request #231 from Sophist-UK/sophist_add_absolutetrack_number

Add %_absolutetracknumber% variable...
Merge pull request #217 from Typz/googleImages

Allow dropping image directly from Google image results.
Add a note about Google images direct drop feature to NEWS.txt
Merge pull request #249 from Sophist-UK/sophist_fix_lyrics_display

Fix lyrics tag displays with []