custom fields work finished int he order editor system
fix for eka7a mistake that actually removes all vouchers instead of just one

https://github.com/opencart/opencart/commit/0a5ba70b49af97d3cdbbc644f251f143493ea742

fix for as validation of the cart quality is complete not required!

https://github.com/opencart/opencart/commit/ac033e32f2ff8f89078f7b03b18a19d61dbc2c92

stop trying to fix stuff that is not broken!
Added missing drop table in install/opencart.sql
more order editor work done
Merge branch 'master' of https://github.com/opencart/opencart
more order editor work done
just fixed a order editor history bug
set the tabs so buttons have to be used for the order editor
sorted order editor back buttons
quick back button fix
Changed response data formatting in pp express ipn.

REF: #1698
Fixed opencart.sql for CREATE TABLE oc_settings

opencart.sql file contained incorrect SQL syntax for creating DB table oc_settings. Though the DROP TABLE was added the part CREATE TABLE IF NOT EXIST was not unified with the rest of CREATE TABLE statements. Therefore I removed IF NOT EXIST part.
Merge pull request #1722 from shadyyx/patch-1

Fixed opencart.sql for CREATE TABLE oc_settings
Fixes custom fields language error.
Merge pull request #1724 from steven-wm/master

Fixes custom fields language error.
https://github.com/opencart/opencart/issues/1235
Merge branch 'master' of https://github.com/opencart/opencart
https://github.com/opencart/opencart/issues/1235
removed ckeditor to be replaced with summernote
OC-1815 - Fixing mandatory fields bug when empty. Added PayPal and cheque fields to be mandatory if selected.