Comment 30 for bug 907056

AND YET ANOTHER COMMIT.

Sort copy availability within call numbers; sort call number availability within libraries; sort libraries by distance from selected search library.

Fixed copy availability sorting in search results - tricksy little bugs just happened to be masked by my previous test data. Also refactored in-db unapi somewhat to cut down on code duplication and make it easier to test subsets of the code.

"Checked out" has been bumped down the the second tier of availability, which is more in keeping with expectations.

Record details availability sorting has been fixed as noted above; all copies of a given call number are kept together, but more available copies are shown first.

Added a fix for the fix for opac-invisible OUs; we had successfully prevented invisible OUs from showing up in the public TPAC in record details, but inadvertently ended up showing all opac-visible OUs in record details.

user/dbs/unapi_improve_limits_and_tpac_display in working. (I call it "unapi_zombie" now locally, because it won't die)