Rewrite gever setup

  - Introduce two zcml directives to configure deployments and ldap profiles.
  - Simplify deloyment form, remove multi-client configuration options.
  - Add custom setuphandlers for local roles, initial repository and document templates.
  - Configure development options and add environment variable to enable them easily.
  - Update branding, add onegovgever logo.

Closes #368
Yeah it seems to work at the moment, but you're right the table-order might change in the future. I would suggest to address the problem as soon as it occurs, this is a development-option anyway :smirk:.