Enabed grouped jset files.  A grouped jset (or .gjset) is a .jset with
meaningful blank lines, so scripts that are grouped together should be run
together in that sequence.  E.g.

scripta.s
scriptb.s

scriptc.s

scriptd.s
scripte.s

Would result in a and b on CHAMP1, c on CHAMP2, d and e on CHAMP3.

This is required for sfcta/champ#43