Fix problem with adhoc variable filters not handled.
Fix problem with saving variables and time per default when saving a
dashboard as/first time.
Fix updating dashboard model after save with saving time/variables
enabled so that next time you save you won't get checkboxes for save
time/variables unless any values changed.
Tests validating correctness if time/variable values has changed.
changes to save modal when saving an updated dashboard
Changed time range and variables are now not saved by default,
you'll need to actively choose if you want to save updated time
range and or variables.
