[#1290 #1299 #1309 #1316 #1317 #1321] Project admin

[KasperBrandt]

Note that the 'user process' PR needs to be merged in first (because of migrations). Done in this PR:

• Make reporting organisation non-required in admin #1299 Make reporting organisation non-required in admin
• Add 'related projects' to project admin #1290 Add 'related projects' to project admin
• Update django_nested_inlines library #1309 Updated django nested inlines library
  • Bugfixes from that library
  • Allows for tabbed inlines (some of the inlines have been set to tabbed instead of stacked)
• Remove goals and categories from project admin #1316 Remove categories, benchmarks and goals from project admin
• Change transaction organisations #1317 Update transactions
  • Receiver and provider organisations now are related to the organisation model
  • Transaction date can be null
  • Transaction value can have 2 digits behind comma
• Remove partner type extra from admin #1321 Remove partner types extra from partnerships in admin

[iperdomo]

Checklist

• Test plan
• Copyright header
• Code formatting

[landscape-bot]

Repository health increased by 0.12% when pulling 83a92be on 1290_1299_admin into 586bf00 on develop.

• 70 new problems were found (including 0 errors and 10 code smells).
• 1 problem was fixed (including 0 errors and 1 code smell).

[landscape-bot]

Repository health increased by 0.07% when pulling 83a92be on 1290_1299_admin into 0d4a1b1 on 1042_user_process.

• 36 new problems were found (including 0 errors and 4 code smells).
• No problems were fixed.