Changes in less files

in form and grid :
added position :relative to fix a probleme when the page scroll, and
the widget will stay in place.
in fields :
changed the position of the cross to remove the file from the list of
downloads from right to left… when the box was too small, the file
could not be removed because the cross was hidden...
Added an equalto parameter for fields and checked the max number of files in upload input

in w2fields.js :
added a control for input file : when you click the input box, the
filedialog will not open if you have max files already in the box.
in w2form.js :
added the equalto option for fields : to use it just add it to a field
entry in fields list :
{ name : 'fieldname', type:'fieldtype', equalto : 'otherfieldname'}
Corrected a bug in grid because of the new status() function conflicting with the xhr status return value

added this commented line because I am not sure we should save the xhr
status
//data.xhr_status=data.status;
Merge pull request #183 from catodique/master

Little changes to less files and 2 little adds. The equalto option will be usefull when checking passwords or emails.