helpers.event just got namespaces
sitemap uses namespaces instead of heuristcs now
initial hook implementation
hooks may be simple strings and other minors

such as log.exception when an exception is actually caught and
a few bugfixes to the previous commit.
extend hook.rst
serving from non-root path works now, closes #116
rewrite httpd.translate_path, closes #117
prevent duplicate summarize link insertion for modus 0, closes #111
--force also affects advanced hooks
parallel execution can be disabled if wished
Merge branch 'hooks', part of #104
initialize step only loads hooks when in compilation mode
damn unittests
Atom/RSS items must not be indented

this causes issues with <pre>-served text, as it includes the
8 spaces of indentation.