libdl.sh: Rename and add CS/RE variables
libdl.sh: Rename and add CS/RE variables

Renamed:
  * dl_cs_upper -> dl_cs_ul
  * dl_cs_lower -> dl_cs_ll
  * dl_cs_digit -> dl_cs_0d
  * dl_cs_alpha -> dl_cs_al
  * dl_cs_alnum -> dl_cs_an
  * dl_re_ident -> dl_re_id

Added:
  * dl_re_1n	(unanchored RE for positive numbers)
  * dl_re_0n	(unanchored RE for unsigned numbers)

donkarlos/libdl-sh