v1.8.0

New features:

• new $perSecond macros #78
• new $perSecondColumns macros see #80
• Date column is now optional #48

Fixes:

• extend queried timerange for queries with round option to provide a graph without gaps in the rightmost and leftmost points #84
• adhocs: check whether it is possibly to apply filters by comparing with parsed query or query builder settings #86