Updated Polish translation
Fix two memory leaks in CDDB dialog

Store a pointer to the start of the GLists, so that the lists can be
freed later.
Refactor some CDDB dialog code to use GString

Avoid a memory leak in error paths, and use GString to simplify the code
a little.
Avoid a memory leak of the disc ID in error paths
Added Norwegian bokmål translation from Åka Sikrom.
Added nb
Fix memory leak when constructing load file dialog
Propagate double-click events on tree view headers

Receiving a double-click event on a tree view is not a good indicator of
whether to change the selection, as the event could have occurred on the
column headers, resulting in the header resizing and the selection
changing simultaneously. Avoid the problem by checking that the
double-click event is in the bin window, and ignoring (and propagating)
it otherwise.

https://bugzilla.gnome.org/show_bug.cgi?id=738830
WIP Use GIO when reading and writing FLAC tags

TODO: Handle non-local files with a memory- (or file-) backed IOStream.
Simplify differences between reading and writing callbacks. Verify that
errors are caught at the first problem and returned to the caller.