gnetlist: New spice-sdb:packsort, generalize to any refdes p

[Dan White]

Sorts by the refdes alpha-prefix (case insensitive) order
given by 'refdes-sort-order which defaults to:
("*" "TP" "A"), yielding the same behavior as the old version
except for forcing device=TESTPOINT (whose refdes=TP?) before
other SPICE directives but after element cards where the net
is used/created.

Any refdes's not explicitly listed are put into the "*" group
to allow certain prefixes to sort to the top of the input deck.

This allows tweaking the output card order since gnucap behavior needs
e.g. ".print" cards before the related analysis card.

[Peter TB Brett (peter-b)]

Hi there,

Please use a symbol rather than a string to indicate where not-explicitly-listed refdes' should be sorted to.

Did you verify that `make check' passes with this patch?

Thanks,

Peter

[Peter TB Brett (peter-b)]

Hi Dan,

Please let me know when you make some more progress with this!

Thanks,

Peter :-)