Lin patch: early reporting of bad module names on the command line

[Ben Kelly]

Normally, lin fully processes command line entry n before moving on to
n+1. This means, if you do something like:
    # lin XOrg7 nosuchmodule
It will sit there for quite some time doing dependency resolution on
XOrg7, and only afterwards complain that it can't find nosuchmodule and
exit.

This patch causes it to do a quick check of all the named packages to
make sure that they exist before it proceeds to full dependency
resolution.

    TF
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