GPII-592: Fixed "more" and "less" keyboard interaction in PMT 

Link to JIRA: http://issues.gpii.net/browse/GPII-592

Had to convert the more/less labels to button inputs with all styling removed. This led to some manual wiring since we lost the "for" label attribute functionality but it was the safer method that worked across various platforms/browsers.

Tested and working under,
Ubuntu 12.04: FF, Chrome
Windows 7: FF, Chrome, IE
Fedora 20: FF