Change the default install sets to include everything but the X sets.

This should cut down on the inquires on @misc/@tech about missing
compilers, etc. In the days of 180GB disks we should not run out of
space too often.

Clean up some logic, removing references to -reuse and -minpat
arguments in install_url(), as install_url() is only called with -http
or -ftp.

Simplify selector setup by noting that $_sets is carefully initialized
to hold only file names ending in .tgz or .tar.gz.

@ok millert

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