switching home and holdingbranch (rewritten)

switching home and holdingbranch (rewritten)

This is an improvement of a patch that has previously been rejected: I wanted to display holdingbranch, kados prefer homebranch
(and in fact it depends on the library choice...)
now, the library can choose, thanks to HomeOrHoldingBranch syspref.

Note that I have changed the description of the syspref to reflect this new use

Signed-off-by: Chris Cormack <crc@liblime.com>
Signed-off-by: Joshua Ferraro <jmf@liblime.com>