* Filter schemes
* Add status filter to schemes pages
* Filter schemes deactivating in more than 6 monts as active
* Always serialize session filters for schemes
* Remove ordering in search, fix tests
* Update incomplete scope
# Context
- https://digital.dclg.gov.uk/jira/browse/CLDC-1732
- data providers are given read-only able access to schemes and locations
# Changes
- introduce `pundit` policies to schemes and locations. the old scope mechanism has been removed
- apply policies at view level so hide write access based functionality from data providers
Manny Dinssa
Robert Sullivan
kosiakkatrina
Phil Lee