Update NEWS for 1.15.1
Bumping version to 1.15.2
applying [PATCH] Fix for Tomboy bugzilla #699727
Explicitly set About and Preferences dialogs to display in the center of the screen.

Signed-off-by: Jared Jennings <jared@jaredjennings.org>
Missing embedded resource in Mac project

Signed-off-by: Jared Jennings <jared@jaredjennings.org>
Update NEWS for 1.15.2
Bump version to 1.15.3
Fixed installer asking to install gtk# when it's already installed

Some systems may have AllwaysInstallElevated property set to "1" and as a
result some of the crucial properties our installer uses are not passed
between the installation phases, because they're not listed as secure.

That causes the installer to think user doesn't have gtk# installed.

This patch marks all properties as secure explicitly and fixed that
behavior.

Signed-off-by: Jared Jennings <jared@jaredjennings.org>
Added buffer flushing to disk for changed note
Use xz compression for dist tarballs
Updated Galician translations
Replace 'sync' with 'synchronize' in user help

Replaces instances of the word 'sync' with 'synchronize'
for grammatical correctness.
Updated Czech translation
Updated Spanish translation
Updated Polish help translation
Reorganize addins user help

New content on addins page, all plugins moved to their own pages.
Re-written addins page content.
Updated Latvian translatio