This adds an ability to fill T4 forms. Triggered through the actions dro...

...pdown upon grant search.

In RNAO's case, we need to send T4A forms to everyone who has been granted more than $500 through the year.

The PDF generation uses the cheque printing threshold and zips the files up.

This also fixes a small bug in CRM_Grant_BAO_GrantPayment::makePDF which ignored any PDF formats and just overrode those with paper size = letter.

TODO: Generate an XML file that gets submitted to the CRA.