YH-429: Initial modal with trees implementation
Merge branch 'master' of https://github.com/yhteentoimivuuspalvelut/ytp

Conflicts:
	modules/ckanext-ytp-main/ckanext/ytp/common/helpers.py
	modules/ytp-assets-common/resources/styles/main.css
	modules/ytp-assets-common/resources/templates/head-styles-drupal.html