fixed wrong link for preview button
fixed staff index page ordering

* added an override for get_index instead of using the simpleadmin default
* modified simpledata all_active() to have an optional ordering param
Merge pull request #507 from unikent/feature/staff-order-495

fixed staff index page ordering
Merge pull request #512 from unikent/bugs/broken-preview-link

fixed wrong link for preview button
Add level to pg/ug outputs + namespace preview endpoint with undergraduate vs postgraduate
Update redirect
Merge pull request #514 from unikent/bugs/preview-ug-pg

Fix preview function for UG/PG
fixed various broken things with simpledata
Add remove functionality to deliveries in PG programmes
Merge pull request #517 from unikent/feature/enable-remove-pg-awards

Add  functionality to delete deliveries in PG programmes
fixed tests for schools
Merge pull request #518 from unikent/bugs/fix-broken-simpledata

fixed various broken things with simpledata
fixed that fact that related courses don't show awards properly
Rework modules task
Merge branch 'develop' of github.com:unikent/programmes-plant into feature/modules-pg
Allow pass of ug/pg param to API functions + fix programme misidentifiying model (use hard-coded value)
Correct cachekeys and extract method
Merge pull request #523 from unikent/feature/fix-awards

fixed that fact that related courses don't show awards properly
Merge branch 'develop' of github.com:unikent/programmes-plant into feature/modules-pg
Only get data for PG taught programmes