* Fix Unintential Deprecated Calls in Tests - FINANCIAL
I think it's best to install these before PR #3166. There are no changes to source code, only to doc-blocks and to test members which continue to inadvertently use calls to deprecated functions.
* Change Tests to Run in Spreadsheet Context
Found and fixed some problems with how MIRR handles errors.
* Start extracting CashFlow functions from Financial, beginning with the simple Single Rate flows
* Extracting Variable Periodic and NonPeriodic CashFlow functions from Financial
* Some more unit tests for exception cases