Module::CoreList->find_version(): refactor for testability.

In order to address weaknesses in the documentation of find_version() in
CoreList.pod, we first had to address its lack of unit tests.  It was
previously only exercised inside the 'corelist' utility.  Refactored
function a bit to expose all its branches for testing.  Then added tests
for the function with and without arguments.  Corrected documentation
for find_version() in CoreList.pod.

Documentation subsequently clarified per feedback from Steve Parker.

For: RT # 125563 (1st of 2 problems cited in that ticket).

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