* pagespec_match() has changed to take named parameters, to better allow

* pagespec_match() has changed to take named parameters, to better allow
  for extended pagespecs. The old calling convention will still work for
  back-compat for now.
* The calling convention for functions in the IkiWiki::PageSpec namespace
  has changed so they are passed named parameters.
* Plugin interface version increased to 2.00 since I don't anticipate any
  more interface changes before 2.0.