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