[graph] adding function for displaying errors
Better path handling in config.

E.g. can change prefix without having to redefine depending paths.
Graph BU.
Showing dropped packets, stacking graphs
Storing temp-files in /tmp
Max size of image
Fix bug with last BU sample being shown as 10%
Support specifying start/end instead of just span
Parameter window for graphs
Merge branch 'dropped_and_bu_graphs'
cosmetic: reindent
adding a status/configuration page
moving extended tests to status page.
removing extra ?> end tag
Show filter count only for authorized MPs.

The count and link will be broken for MPs which isn't authorized.