Fixed bug with value-constraints query parameters
Previous versions had a problem with calls like
:query_parameter name:SOMECONSTRAINT
since the implementation clobbered the name variable. Versions of NSF
later than 2022-01-21 support "nsf::parseargs" with the "-asdict"
option, which can use all the nsf::parseargs options and avoids
clobbering.
Added tests of "xo::cc query_parameters" to the regression test suite.