Merge pull request #6 from tudorbarascu/master

added pipe diameter of 350, 1000 and 1200 for steel/acier pipes, added R...
fix date
fix allow null
fix provider in hydrant form
add geometry to pipe schema error
add self reference for pipes
completed relations
Merge branch 'master' of github.com:3nids/qWat
Merge pull request #7 from tudorbarascu/master

Materials table completion/fix with RO translation