GREG-243: Adding possibility to set date in consent endpoint. Showing ID for person-consent connection in endpoints

Add a toggle for the iga identity check

See merge request !301

GREG-233: Prohibiting user from continuing with invalid phone number

See merge request !304

GREG-232: Fixing wrong error message

See merge request !303

Utkast til språkvask

See merge request !302

GREG-225: Gender not sent to server in all cases

See merge request !300

Show invitation status

See merge request !299

Since we may not want to enable the identity check, it must be
togglable. This commit adds environment variable
REACT_APP_ENABLE_IGA_CHECK for toggling the check in the frontend, and
django settings variable IGA_CHECK for toggling the check in the
backend.

Relabel the invitation resend button to make its purpose more clear.

Move serializers only used by gregui.

GREG-208: Adding constraint to prevent identity duplicates

See merge request !297

GREG-220: Fixing crash on missing role start date in frontend

See merge request !296

UiO: Sjekk om fødselsnummer/passnummer er i bruk i IGA

See merge request !286

Make type and ou choices required in new role form

See merge request !293

Adding a role without selecting either of these makes no sense, and will
be refused by the backend accordingly.

Displays a warning if the identifier the sponsor wants to verify is
already assigned to someone in the IGA, or if the backend could not
contact the IGA to check.

Queries iga for an external id matching ours. If a match is found, the
name of the owner is returend. Otherwise we return null. Uses the new
iga module to fetch the data.

Makes it possible to search for external ids (nin/passport) in iga
without refering directly to the respective clients.

scim client will be used for fetching iga data for UiB

Fix bug where nin was not saved from feide

See merge request !298

Greg 217 padding margin font

See merge request !294

Add tests of has_mandatory_consents property

See merge request !292

Make logo link to front page

See merge request !291

Sprinkle unicode characters on tests

See merge request !288

Was removed by mistake at some time in the past. Introduced a few tests
to ensure that things work as expected.

Resolves: GREG-223