Refactor code.
(In [601]) re #190, abuse "item.delimit" to use prerootid title
(In [600]) re #190, pass joined html-title to html-gen template
(In [593]) re #190, tracpygments not needed in 0.11
(In [585]) re #190, delete temporary wikipage after usage
(In [572]) re #190, wiki_page_changed_do
(In [571]) re #190, renamed Html Gen? to Wiki Static Html Gen?
(In [568]) re #190, moved ticket_to_ticket to unused.py
(In [562]) re #190, some preparations for refactoring