Revert "Fix date range inputs."

This reverts commit 4efe68ad26a2b14ed6743b80a30297885bc643c8.

Conflicts:
	src/templates/waterfall/list.twig
Remove what I hope are debugging header calls.

Database condition mappers should really not be adding headers to the
response. It is all sorts of funny.
Make request_start and request_end more accepting.

Only accepting timestamps is a bit janky. Allow SQL style date times as
well. Humans, not robots use the UI.
Add note to inputs about accepted formats.
Don't explode on invalid dates.
Fix double output and re-indent code.
Remove link to file that doesn't exist.