TeXLive version printing updated to include revision

Until now, when find the versions of the TeXLive packages, we would assume
that `cat-date' is always present (because some packages don't have a
version!). However, apparently an update has been made in the TeXLive
Manager (`tlmgr') and `cat-date' is no longer present! As a result, none of
the TeXLive packages were being printed.

With this commit, it now assumes that `revision' is always present for
every package, but it also attempts to read `cat-date' (for backwards
compatability). When `cat-version' isn't present, it will try printing
`revision' and if that is also not present, it will print the date.

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