Fix symlink issue. See https://drupal.org/node/1372442#comment-6099598
Fixed bug where if no-backup option was present, files were never deleted from projects.
describing new "shallow-copy" option
implementing "shallow-copy" option for git downloads
shallow-clone and working-copy don''t making sense together
Fix D6 site-install. Was broken in 44a9420b6
Better management of errored project's status in release info engine.
Adds tests for pm-updatestatus.
Rename update_info engine to update_status and convert into OO.
Change inheritance pattern in StatusInfoDrupal classes.
Use backend results instead of table output in pm-updatestatus tests.
Reduce duplicity of code in update_status engine, and decouple from constants declared in update.module.
Simplify checking of version-specific requests in pm-updatestatus.
Merge pull request #911 from jonhattan/update_info-oo

Rename update_info engine to update_status and convert into OO
Error when a project has no releases (continuation of 9cfd9ca600).
Fix #819. Document how to install for all users on a server.
Fix code comments.
Merge pull request #797 from mortenson/no-backup-remove-files

Fixed bug where if --no-backup was provided, files were never deleted from projects.
Remove pointer to drupal.org/project/drush
Uppercase Drush