New Math::GSL example: Erfc check

[Jonathan Leto]

Howdy,

I have added Keith's erfc() check (with a small tweak to report the
max error) as an example in the Math::GSL distribution:

http://leto.net/gitweb/?p=Math-GSL.git;a=blob_plain;f=examples/sf/erfc_check;hb=HEAD

Cheers,

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[---------------------]
Jonathan Leto
jal...@gmail.com