MT#6827 Deprecate linerange_num field.

In hind-sight, this field appears like an ugly hack to determine
the proper line range in the aaData array fetched via ajax. However,
we already have the correct range_id, and using the index of the aaData
has so many possible side effects to break everything, that I'm wondering
what I was thinking when adding it :p
Merge branch 'master' of git.mgm.sipwise.com:ngcp-panel