#18 Add an attribute to the Form tag to help exporting to excel

[Jonny Reid]

Need to add an attribute to the Form tag that can be
used when running a results screen in excel or XML
export mode. This would essential switch off all the
extra features we have added the the FORM tag and
only keep the bare minimum necessary to support a
usergrid for a results screen. This will get round
the "more" detail popup div layer being exported to Excel
along with the table.