Prevents plugins from being updated by the WordPress updater if they are under Subversion revision control (or other systems).
Checks for the presence of the
.svn directory in each plugin's directory. Disabled for plugins with their files directly in the
/plugins/ directory to prevent false positives.
Also supports other systems through the use of the
REVISION_CONTROL constant. Just set this to the directory created by your revision control system in your
Based on code by PeteMall.