Default unset bit now does not accept/skip group separators in
numbers.

See .idl description comment for why this is incompatible and how.

This actually uncovered a "bug" (or at least unexpected) in the
Math parser that parsed "0," as one entity instead of "0" followed
by ",". As obtaining the text form appends a blank after each
entity the sw/qa/extras/rtfexport/rtfexport.cxx testMathEqarray()
testcase had to be adapted.

Change-Id: I2b605742ab3d8a9bb81ad6880faf050535dc80fa
Reviewed-on: https://gerrit.libreoffice.org/64270
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>