fixes #415 - Operating systems debian types were always shown

XHTML compliance

fixes #331 - Operating system edit page error messages are out of alignments

Fixes #260 - Switch to using STI for OS families

fixes #273 - Provide a "Getting started" front-page

Fixes #262 - Architecture selection on create/edit operating system form

Ensure that all index views and controllers are consistent

Ensures that all controllers use @search in the index method
Ensure that all index views use pagination

Fixes #248 - Generalise tab management and search facility

The search facility is now available from all controllers.
The search bar is only displayed if there is a partial
<controller_name>/_search_line.html.erb available.This partial also
describes and implements the possible search parameters for this controller...

Fixes #232 - Removes AS from Users page

The password verification test has not yet been implemented but will get done in AuthSourceInternal fix
All tests now pass These tests now work whether settings[:ldap] is enabled or not
Plus whitespace fix

fixes #219 - debian should not be the default operatingsystem family