Draft: Resolve "Default inhouse proposal names can be official proposals"

Closes #2944 (closed)

This MR provides the option to specify the proposal type explicitly. The proposal type is derived from the proposal name when not specified.

The original issue at the CRG beamlines can be solved like this:

DEMO_SESSION [1] newproposal("02-1234", proposal_type="crg")

The proposal name in BLISS and ICAT is "02-1234". However the data directory is "/data/visitor/bm021234".