Feature: Store networks with fallback emails in the database. (Redmine issue: #6227)

lib/hawat/blueprints/networks/templates/networks/show.html

lib/hawat/blueprints/whois/templates/whois/_macros.html

...awat/migrations/versions/c91b23f77fc1_add_is_base_flag.py

lib/mentat/datatype/internal.py

lib/mentat/datatype/sqldb.py

lib/mentat/module/netmngr.py

lib/mentat/reports/event.py

lib/mentat/reports/test_event.py

lib/mentat/services/whois.py