[Feature Request] Ability to lock time range on panel, independent of dashboard time

### What Grafana version are you using? Grafana v5.0.3 (commit: 91162f3) ### What datasource are you using? InfluxDB ### What OS are you running grafana on? Ubuntu I would like the ability to lock a panel into a specific time range, not a relative time shift of the dashboard's time. For example: we use Grafana to visualize patching statistics and we are interested in how each deployment performs over the first X days of it's deployment. To accomplish this for January Patches I utilize both the Time Shift and Relative Time override  The issue with this is that the panel itself is set to display all the information for the year so far, as it updates on a daily basis:  The leads to an issue wherein if the dashboard time changes, since the panel time range is a modification of the dashboard time, it is now presenting a different time range than what we want to see. What I get now is a panel starting at now() - 50d and ending at now() - 50d + 35d What I want is a panel starting at January 1st, 2018 00:00:00 and ending at January 1st, 2018 00:00:00 + 35d Without this, I need to update the dashboard daily which is cumbersome and defeats the purpose of having this display be automated at all.