customise admin table for SDM
added table class for DM front page
move colours into _colours, admin table css tweaks
id cols styled differently
add filter row to DM/SDM index tables
hide table filter rows until table-filtering is implemented
intra-column table heading borders are darker
use YYYY/MM/DD format in tables
date_format set to Zurich's dd.mm.YYYY
Merge branch '191z-admin-tables' into zurich

Conflicts:
	templates/web/zurich/admin/index-dm.html