Review how status info is calculated

[lcreid]

Is the status info calculated from the invoice allocations? It should be, probably.

[lcreid]

The following applies for invoices that are Invoice#complete? and Cf0925s are Cf0925#printable?.

• "Total Funding for Year" is either $22,000 or $6,000 currently, depending on age.
• "Funding Approved" is the total of all the Part A and Part B requests for the fiscal year.
• "Funding Remaining This Year" is the "Total Funding for Year" minus the "Funding Approved".
• "Funding Spent" is the sum of all InvoiceAllocations for the fiscal year. This depends on back-end validation being implemented for InvoiceAllocations. See Issue #72.
• "Out of Pocket" is the sum of all Invoice#out_of_pocket for the fiscal year.

[lcreid]

It's very interesting how we have a huge number of test cases for this, all testing the absolutely wrong thing since we added InvoiceAllocation, yet the tests don't catch it. Adding the specific test cases would have caught issues, and probably would have shown where some of the other test cases were wrong, but it feels like there's a gap here in the TDD approach.