working Groovy side changes to allow dateRange filter type to be configured for a layer
Merge branches 'date_range_filter' and 'master' of https://github.com/aodn/aodn-portal into date_range_filter

Conflicts:
	grails-app/migrations/changelog.groovy
	test/unit/au/org/emii/portal/FilterControllerTests.groovy
	test/unit/au/org/emii/portal/FilterTests.groovy
removed println
Updating indentation that hasn't been fixed before
review changes. Rename variables, validation in groovy form, changeset typo
changed grails error message name
Merge pull request #630 from aodn/date_range_filter

Date range filter