numeric partition names don't work

[kjdon]

using filters called, eg 2001, 2002, and then building partitions on these, results in a subcollectionmap like 2001->20, 2002->21

Then, we you generate the subcoll section macro, _jselection_, it has inside <option name="21">_21_ This _21_ is thought to be a parameter reference to something passed in. So, it appears that macros cannot call other macros inside that are numeric.

We need to modify the mapping list for the subcollection (and index) so that numeric shortnames are not used.

[kjdon]

process_field in basebuilder modified so that digit only short names are not produced.