(FR #1371) Begin to generalize checks import files to handle different formats

* Support for minor extensions to the ChecksFile import
* Handle dollar sign in total amount
* Enable importing EFT contributions
* Able to import "No Thank You" reason

Change-Id: Ibd54431f40b4fcd3ef795436c6c251b728eeef91
Merge "(FR #1371) Begin to generalize checks import files to handle different formats"