Persist default axes of a visualization [WIP]

The previous code had two issues. The first was a bug in using the
user-specified y-axis column for checking if a goal had been
met. Beyond that the pulse code didn't recognize those user specified
x and y axes either. This commit uses the user specified columns, when
they are not present defaults to the previous first/second column
behavior in the resultset.

Make expression editor field popover expandable

Remove dead link

This was moved to the operations guide.

On export, format dates to not include times

Currently all :type/DateTime values, including :type/Date values are
serialized as ISO timestamps, which includes the time and
timezone. This commit handles :type/Date fields differently, emitting
only the date (year, month and day).

Fixes #5828

Add disable humanization option

Psalaberria002 hyperunique

Dashboard multi-param filters

fix Calendar.unit.test.js not using mocked date