replace INDRULE with var carrying actual coderef

This is so that the nfa routines can call .NFA on the coderef to extract
the NFA and merge properly when <foo> refers to a lexical regex.
coloncircumfix was stealing :() pseudo-sigs

(This was due to the new longest-literal tiebreaking rule.)
<?{}> parse depended on non-lltm ordering
force <.foo> to call method even if sub declared
nqp wants 1/0, not True/False
Merge branch 'nom' into longlit