LP#1904244: mark various fund columns as required in the IDL

LP#1904244: mark various fund columns as required in the IDL

In particular:

* Fund: org unit, name, year, currency, code
* Fund allocation: linked fund, linked funding source, amount,
                   allocating user
* Fund tag: owner, name
* Funding source: name, owner, currency, code
* Funding source credit: linked funding source, amount

As a consequence of this change, various recording editing interfaces
will now require that input be supplied for these fields.

Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>