Don't set max heap size unless testing; only reload src/ for dev server

Add an in-context test fixture to help diagnose stale test data

This commit adds an expectation_options namespace that the
expectations library will automatically load for functions that should
run before/after/around each test expectation.

An 'in-context' is in that namespace that will run around each test
expectations checking for instances of a specified model. If one is
found the test run exits with helpful information in tracking down
where the stale data came from.

By default this function is noop and no models are checked. Adding
modes to the `models-to-check` var will enable this debugging and if
stale data is founc, the `with-model-cleanup` macro in
test/metabase/test/util can be used to ensure that stale data gets
removed.

Fix invalid SQL for timestamp comparison in psql

Fix frontend test runner on Java 9

Dynamically space x axis ticks

Make fill-timeseries work on not evenly spaced data

Round ticks in stacked normalized charts

* virtualize select content

* clean up example

* show examples

New chart settings to change title of serieses (#5951)

* update nav

* tweaks

* nav cleanup

* test fixes

Refactor pulse sending and add tests

This commit adds some separation in the pulse code to allow tests to
be written that don't require sending emails or the other code that is
more side-affecty.

* fix calendar spacing / remove maxWidth on popover

* only remove max-width on date filters

* make sure qb timeseries mode gets the class

* add autoWidth prop to Popover and apply

* fix typo

* Move conditional popover content width logic to FilterPopover

* ignore flow

Java 9 fix: add java.xml.bind module back to classpath 

Use HTTPS for Redshift driver