Support slugs in indicator

The view forced the id to be a number, and it was hard to use slugs then.
Fixes that.
Saner indentation of broken line

Changed indentation of broken line to two tabs to make it function better
with variable tab width.
Merge pull request #7 from bdo-labs/slugs

Support slugs in indicator
Charts and data for charts

Added charts and logic for generating data for charts and changed logic for
selecting measurement so that the aggregated measurement is used.