versioncontrol 6.x-2.0-beta6

Changes since 6.x-2.0-beta5:

• #1045742 follow-up: Do not use drupal_set_time on D6.
• #1642326: Improve repository synchronization failure behaviour.
• #1045742: Change VersioncontrolRepository::update_method to be a simple flag for cron.
• #1131084: Let use $conf to set per-backend/per-plugin_slot plugin defaults.
• Document return value for VersioncontrolRepositoryHistorySynchronizerInterface synnc related methods.
• #493902: Define naming convention for vcs hooks.
• #1642310: Optimize logic for branch deletion with nested option.
• #1131084: Stop using $conf variables to define global default plugins.
• #1045496: Stop using 'repo' shorthand on code variables.
• #1045496: Stop using 'repo' shorthand on simple strings and documentation blocks.
• #1704548: Remove the idea of selected label.
• No need for hook_theme on commitlog anymore.
• #1291904: Add documentation for the versiocontrol_code_arrival hook.
• #1513746: Fixed Commits tab still shows for blocked users.
• Improving comments.