frontpage overhaule, more bootstrap

a new layout file
removed custom menu stuff
try to make 100% bootstrap, hopefully better theming possibilities
hack for anchors in top
better breadcrump links in user manual
rest of changes ...
dutch translation of frontpage
handled suggestions from several people
added the frontpage to the other main entrance pages
Merge pull request #70 from rduivenvoorde/newfrontpage

Newfrontpage and website update