OS X: Use LetsMove to simplify installation.

In preparation for shipping OS X builds as ZIP archives, integrate
LetsMove.  When the user launches the app from a location different from
/Applications (e.g.  from the Downloads folder), the app offers to move
itself to the correct place.
OS X: don't leave stray SUFeedURL in user defaults.
Fix randomly broken list sorting.

UErrorCode must be initialized to U_ZERO_ERROR, otherwise collator's
compare() would just return the values are equal (go figure).
Remove the outdated, unused TODO file.
Workaround bogus msgcat conflicts.

Sometimes, msgcat produces conflicts in automatic comments (see the gory
details at
https://groups.google.com/d/topic/poedit/j41KuvXtVUU/discussion).  As a
workaround, just filter them out.
Fix non-OSX compilation.
Fix reporting of Lucene errors.

LuceneException::what() isn't implemented, so all errors were reported
as "unknown exception".  Report the actual error, with error code,
instead.
Create TM directory if it doesn't exist yet.
Merge pull request #46 from Hyllegaard/master

Update Danish translation.
Merge pull request #1 from vslavik/master

Update