discount: update to 2.2.7d. From the changelog:

* port the m-e footnote bugfix to v2maint
* trivialities; change the -fstrict option description
* add a fistful of test cases for the new! improved! Markdown.pl
  compatible <tags>
* rework the tag handler to more closely adhere to Markdown.pl's
  observed behavior; also treat incomplete tags as actual tags in
  compatability mode (-fstrict)
* weird behavior on freebsd 4.8 w/ gcc 2.95.4; if a #ifdef ... #else ...
  #endif wraps the end of a if () it pukes up an error about a syntax
  error in a macro; pull those tests out and conditionally #define a
  macro instead
* the behavior of tags-starting-with-alpha-/-! was not like that of the
  reference implementation; fixed (in a very script-kiddy leaky fashion
  which I can't resolve with a runtime flag thanks to the 32 bit flags
  field in the 2.x series :-(

(schmonz)