Cleanup expanded target path (see ce5a4749) from whitespaces
Also tag <td> with the itemid and introduce tdattrs support
Propagate itemid change to webpage_packed.html
Use nvd3 instead of graphael for plots
Disable tooltips
Make tooltip disabling parametric
Fix handling of empty labels
Add plot color handling
Allow specifying more plot colors than the number of lines
Add initial support for drawing a plot title