Splits the hard-coded hold/transit slip logic into 3 types of slips (hold_slip, trans...

Splits the hard-coded hold/transit slip logic into 3 types of slips (hold_slip, transit_slip, and hold_transit_slip), and ties them into the receipt template system.  The ui.circ.old_harcoded_slip_template (not yet wired in) org
unit setting will revert to the hard-coded logic.  The new templates are not 100% identical to the hard-coded slips, mainly because they're brain-dead simple and don't lend themselves to conditional display logic without delving
into inline javascript.  Testing welcome.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@14078 dcc99617-32d9-48b4-a31d-7c20da2025e4