Renamed IsOrphanBranch to CanParseRev

TODO: Output an error message if range is not an orphan branch.

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Fixed issue #1147: Ability to filter out branches in Log dialog

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Updated documentation

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Fixed issue #1628: Support commit ranges in log list

Signed-off-by: Sven Strickroth <email@cs-ware.de>
LogDlg: Allow arbitrary gitrevision ranges from cli

Signed-off-by: Sven Strickroth <email@cs-ware.de>