The output format for donations changed slightly when we switched to
Beancount at Conservancy from Ledger CLI. This change now assumes a
specific format of the output for the donations, and takes a
filehandle in the constructor to receive the data.
As such, this effectively makes it slightly less dependent on any
specific donation database, since as long as you can get it into the
format the regex herein expects onto a filehandle, it doesn't matter
what system you use underneath.
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