* multi_page_pdf
  * using double_forked_exec now (to avoid zombies)
  * removed hack needed under FreeBSD 9.0 because of XML::LibXML & GD
    problems (see http://www.freebsd.org/cgi/query-pr.cgi?pr=171353)
* show_blockings: use -clever_center in mark_street() call

  Also copied the -clever_center documentation from mark_point to
  mark_street.
* bbd.pod: documented "priority" directive
* fragezeichen2org.pl: handling priority directive
* fragezeichen2org.pl: off-by-one error in date handling

  Now the handling in the normal section and the alternative sorting
  section is consistent.
* bbbike.el: added functions for fetching URLs in bbd files
  (bbbike-view*url)
* comment preamble for bbbike.el
* data update