tasks:
(In [277]) re #124, placed diafania on global left (tiny workaround)
(In [276]) re #124, placed diafania on global left
(In [275]) closes #124, project nav removed by default (using standard mechanisms of trac) closes #125, use standard navigation removal
(In [274]) re #124, remove some projects out of the global navigation
(In [273]) re #124, corrected website navigation
(In [272]) re #124, make hit on root without "/" work
(In [270]) re #124, left navigation space is now always there, menu is currently showed only for wiki (thus main navigation still kept)
(In [269]) re #124, increased width thus the sidebar can appear for other content than wiki (e.g. tickets) too.