fixes #436 while keeping the constants that are relied on by many parts of the code that access this class without creating an instance of it

check if all database migrations were created from django model

See merge request NCER-PD/scheduling-system!314

Update readme.md to new gitlab url

See merge request NCER-PD/scheduling-system!339

fix #436 also remove ordering from columns in mail template

See merge request NCER-PD/scheduling-system!334

consider the case that an appoinment is not set to a particular visit. the...

See merge request NCER-PD/scheduling-system!333

added warning in case no voucher templates are found

See merge request NCER-PD/scheduling-system!335

fix #433 Search form should always redirect to web.views.kit_requests

See merge request NCER-PD/scheduling-system!332

fixes #425 adds week day to daily planning

See merge request NCER-PD/scheduling-system!331

Fix/427

See merge request NCER-PD/scheduling-system!330

tentative fix

See merge request NCER-PD/scheduling-system!329