new option --cleancpansources

...which cleans up the CPAN sources cache
/opt/cpan/sources, so it even works when
someone replaced files on the CPAN mirror,
like it happens on the Perl::Formance Pinto-based
mirror. To not fail due to CHECKSUM mismatches you
can provide this option.
generated CPAN::Config now respects PREFIX
I am so sick of fixing other modules' dependencies... *sigh*
move variable declarations after getopt

...to make them work if prefixbase was set
from options.
emacs highlighting
cleanup cpan build dir
use DNS rotating mirror, not fix one
provide default_confargs
perlformance with special build options

...to get more stable numbers