ZDIOUT1: Include encountered extra global subscripts in output
ZDIOUT1: Include encountered extra global subscripts in output

When a global subscript we currently do not handle is encountered in a
file global root or entry global root, generate a SUBS tag noting its
name and immediate value.  Also add comments noting any extra global
nodes found inside fields.  Single-valued fields should have no
children, multiple-valued fields should have no immediate node.

OSEHRA/SKIDS