Reverses effect of earlier changeset.
Examples:
use Siad007\VersionControl\HG\Factory;
$backoutCmd = Factory::createBackout();
$backoutCmd->setRevision('revision');
$backoutCmd->setMerge(true);
$backoutCmd->setTool('tool');
$backoutCmd->addInclude('includePattern');
$backoutCmd->addExclude('excludePattern');
$backoutCmd->setMessage('text');
$backoutCmd->setLogfile('logfile');
$backoutCmd->setDate('date');
$backoutCmd->setUser('user');