#155 Virtual perlmodule support

[Ben Hines]

VirtPackage.pm needs to be exteneded to add pseudo
packages for each perl module a user has installed on their
system (not including those under /sw). This can probably be
done in a generic fashion. However that might lead to a very
very long list, so we might want to just keep a list of virtual
modules we want to have in fink.

This is to prevent this:

Depends: foo-pm | system-perl580 | system-perl581 |
system-perl582 | system-perl583....

Instead, fink will detect foo-pm on a user's system and
provide it via a fake package. There should not be a problem
with versioned provides since these are pseudo packages
with versions, not just 'Provide' ed packages.

[Daniel Macks]

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Check out drm's patches for fink 0.20.0--> 0.20.1

[Ben Hines]

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Those are Provides. We can create full packages (with versions) as stated above.