Update requirements.txt
Merge branch 'master' into fs-dev
Merge branch 'fs-dev' of github.com:idlweb/openordini into fs-dev
Merge branch 'fs-dev'
Merge branch 'master' of github.com:idlweb/openordini into fs-dev
fix registration form and template
fix a bug in registration form

some fields that are not shown should be marked as not required
commit ISSUE regbackend #3
commit error registration
Merge branch 'master' into fs-dev
link subscription plans to institution

refactor payment logic