Admin page additions

[stvnrlly]

This makes the following changes:

• Change the title of the Opportunites addition page from "Add opportunity" to "Add Procurement"
• Change price_min and price_max to dollar_value_min and dollar_value_max, along with an include_options field
• Add a dropdown menu for the fiscal year, showing the current year and next 4
• Add a dropdown menu for the fiscal quarter, with options for 4 quarters and "TBD"
• (Re)create a management function—./manage.py load_opportunites—to populate historical data on offices, opportunities, and advisors, which allows future use of that office data, as well
• Add the ability to search by opportunity ID.

[codecov-io]

Current coverage is 91.74%

Merging #28 into develop will decrease coverage by -1.38% as of 6917eef

@@            develop     #28   diff @@
=======================================
  Files             8       9     +1
  Stmts           189     339   +150
  Branches          5      17    +12
  Methods           0       0       
=======================================
+ Hit             176     311   +135
- Partial           0       3     +3
- Missed           13      25    +12

Review entire Coverage Diff as of 6917eef

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[stvnrlly]

OK, I think this is ready to review for merge.

[vdavez]

It seems like we could use additional test coverage around the load_opportunities command to ensure the right number of opportunities are loaded.

[vdavez]

I think that, in a prior review, we thought this could be replaced with strftime.

[stvnrlly]

Maybe I'm missing something, but I don't see the benefit of that. The model currently uses Django's DateField for the estimated solicitation date, which takes a datetime.date as an input. Do we want to change that field to a string?

[vdavez]

👍