Refactor installer::sorter

[Tim Retout]

Hi!

Here are a few patches related to installer::sorter.  I've tried to
keep them low-risk, because much of the code is called during Windows
builds, which I'm not yet testing.

I think the sort algorithm used currently in installer::sorter must be
equivalent to bubble sort; in any case, I removed two of the
subroutines, and replaced the third with a Schwartzian Transform
(which might be overkill for this case, but I need to check the
callers).

I added a unit test for the remaining sort function, but I haven't
tried to plug it in to the build system or anything.  I tried to adapt
the standard license header template to Perl comments.

Kind regards,

-- 
Tim Retout <tim at retout.co.uk>
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