Align History graphs

[jlpouffier]

When displaying multiple entities in the history tab, the multiple x-axis are not aligned, which can make some analysis difficult and misleading.

Have a look at this picture and look at the 2 data point at 17:00 ...

Confusing, right ?

FYI : I decided to open a discussion and not a bug, because I don't think it's a bug per se...
Nothing is broken, it's just confusing

[zsarnett]

#11265

Main Discussion should be held here