VAM CP x-axis bug #1085

... fixed by
...... not considering Y-Axis values in the 0 to 4.993 minutes range
which are not shown for VAM anyway
... both in standard view and in compare view / intervals and date
ranges
... handle intervals below 4.993 minutes properly (since they are not
shown in CP VAM)
Merge pull request #1135 from Joern-R/cpvamscale

VAM CP x-axis bug #1085