module directory has changed (eg. "darwin-2level" vs.
"darwin-thread-multi-2level").
binary packages of perl modules need to be distinguishable between
being built against threaded perl and unthreaded perl, so bump the
PKGREVISION of all perl module packages and introduce
BUILDLINK_RECOMMENDED for perl as perl>=5.8.5nb5 so the correct
dependencies are registered and the binary packages are distinct.
addresses PR pkg/28619 from H. Todd Fujinaka.
Some applications, notably the numbering of points in outlines,
use a scheme that starts with the letter "a", goes to "z", and then
starts over with "aa" thru "az", then "ba", and so on. This module
provides functions that deal with that numbering system, converting
between it and integer values.