banging on the 'dos print' kludge. There was a 1.2 regression involving a file path...

banging on the 'dos print' kludge.  There was a 1.2 regression involving a file path, which still needs to be tested with an actual windows machine and receipt printer.  This changeset also adds linux lpr support for 'dos print'.  I may need to use this print strategy for incremental printing, as much as it pains me.

git-svn-id: svn://svn.open-ils.org/ILS/branches/rel_1_2_1@8167 dcc99617-32d9-48b4-a31d-7c20da2025e4