make account code unrequired

[PetrDlouhy]

This is my attempt to address issue #13. I don't know what are the codes used for, so I am not sure if it doesn't break anything. But basic things seem to work for me.

I use django-hordak to make account for every user, so it would be quite difficult creating codes for all of them (and maybe impossible due to the possible number of codes).

[adamcharnock]

Thank you for this @PetrDlouhy! I'm taking a look now. I'll probably push some changes onto this pull request if that is ok with you?

[adamcharnock]

BTW, I just rebased this off master, because I'd forgotten to merge the django2 branch into master, and as a result this PR was missing some Django migrations.

[coveralls]

Coverage decreased (-0.04%) to 95.446% when pulling 8e73ae707e573e9529cdf82abed984ac76bd6ba7 on PetrDlouhy:unrequired_codes into 508da63039d14a29820e4aa94a459f8cafcad7ca on adamcharnock:master.

[adamcharnock]

Hey @PetrDlouhy, I've pushed a few commits to just wrap up this change. These commits:

• Update the Postgres trigger which sets the full_code column
• Test the __str__() method on the Account model
• Test the account creation/deletion views with an empty code

Next steps:

1. Wait for travis to finish building
2. Can you feedback on these changes? Do they work for you?

Once the above are done I'll be happy to merge.

---

Importantly: You'll need to re-run migration 24 as I have modified the steps within it:

# Rollback to migration 23
./manage.py migrate hordak 0023
# Reapply 24
./manage.py migrate hordak 0024

[PetrDlouhy]

@adamcharnock Nice. So far it seems, that it is working perfectly.

[adamcharnock]

I'm glad to hear @PetrDlouhy! I'll merge it in then, thank you for the PR! 👍

[adamcharnock]

I've just released 0.8.0