Leave one copy of each duplicate hash

[mkazin]

For any duplicate hash found in the input files, leave at least one copy. Ideally, the one already named properly.

This should be a unit test in the now-testable Task/Action classes.

SIMULATION Delete statement (1).pdf (Found duplicate hash (64cd378db60b38a5c9f9d79f937c64d8) shared by [2017-Q3 Quarterly Statement.pdf].)
SIMULATION Delete statement (2).pdf (Duplicate hash: 313bbe96f833ae1863f3d95044e10f5c)
SIMULATION Delete statement (3).pdf (Found duplicate hash (25ca43eca67e9230ab684b0da9167157) shared by [2017-Q1 Quarterly Statement.pdf].)
SIMULATION Delete statement.pdf (Duplicate hash: d87465b7adf08e3cdb26e203c2877173)
SIMULATION Rename statement (5).pdf to 2018-Q1 Quarterly Statement.pdf
SIMULATION Delete 2017-Q1 Quarterly Statement.pdf (Duplicate hash: 25ca43eca67e9230ab684b0da9167157)
SIMULATION Delete 2017-Q3 Quarterly Statement.pdf (Duplicate hash: 64cd378db60b38a5c9f9d79f937c64d8)

I should have a copy of those destroyed files in my original test data folder.

très embarrassant