fix errors during progress_bar initialization in wp table
pourcent -> percent
the glorious table layout of the progress_bar doesn't work with inherited min-width
fix wp-table-group-headers when grouping by percent_done
Redesign the progress_bar html

Do not use a table layout anymore. Also the progress_bar helper
is documented now.
only redner start/due-dates in roadmap if they are present
remove double percent in roadmap progress bar
remove redundant curly braces
adapt karma tests to new progress bar
move progress_bar css from legacy to regular css. add styleguide
Merge pull request #2004 from opf/fix/16483_progress_bar_was_broken

Fix/16483 progress bar was broken