improve UIDMaps

[Nicolas Sebrecht]

[PATCH 1/3] UIDMaps: fix copyright line and re-order imports
[PATCH 2/3] UIDMaps: code cleanups and improvements
[PATCH 3/3] UIDMaps: correctly protect from concurrent writes

The following changes since commit 3293b75c9c735f054eb267afcc6f3f9713e6c1aa:

  release.sh: get_git_who(): remove unnecessary blank line (2016-06-27 16:11:44 +0200)

are available in the git repository at:

  https://github.com/nicolas33/offlineimap.git ns/uidmaps

for you to fetch changes up to 815a7d94bee34dcfffc9ac459abde5d83bd78f2e:

  UIDMaps: correctly protect from concurrent writes (2016-06-28 15:41:27 +0200)

----------------------------------------------------------------
Nicolas Sebrecht (3):
      UIDMaps: fix copyright line and re-order imports
      UIDMaps: code cleanups and improvements
      UIDMaps: correctly protect from concurrent writes

 offlineimap/folder/UIDMaps.py | 82 +++++++++++++++++++------------------------
 1 file changed, 37 insertions(+), 45 deletions(-)