Removed check to accept the GNU GPL licence during install.
Removed private variable (unused) from step 1 install controller class.
Merge branch 'v1.5.6.1' of git://github.com/opencart/opencart.git into v1.5.6.1
Merge pull request #926 from e-piksel/v1.5.6.1

Update pp_express_view.php
Fixed filter delete error
Undefined index: filter_id file admin\controller\catalog\filter.php on line 188
Merge branch 'v1.5.6.1' of git://github.com/opencart/opencart.git into v1.5.6.1