Add very basic support for PIV cards.
* src/cm-piv.c: New. * src/cm-piv.h: New. * src/Makefile.am (gpa_cardman_sources): Add them. * src/cardman.c: Support PIV. * src/keytable.c (gpa_keytable_ensure): New. (gpa_keytable_lookup_key): Replace code by a call the new func.
Take care: I wrote that code years ago and it had not been updated to
newer GTK+ versions, debugged, or even has a proper layout. But it is
better to have it in the repo than only in my stash.