* fixes bug where deduction of a recorded intervention could be deleted from the eco account detail view
* improves check_for_recorded_instance() logic
* improves rendering of detail view on compensation-like objects to highlight missing data
* refactors intervention/forms and ../modalForms into individual files in separated packages
* forms.py has been renamed into intervention.py, now can be found as intervention/forms/intervention.py
* modalForms.py has been split into individual files living in modals package, can be found as intervention/forms/modals/...
* adds needed migrations
* refactors forms.py (700+ lines) in main konova app
* splits into forms/ and forms/modals and single class/topic-files for better maintainability and overview
* fixes bug in main konova app migration which could occur if a certain compensation migration did not run before
