[tex-live] beamer: has more dependencies?

[Ivan Shmakov]

	The `beamer' package (as per recent `texlive.tlpdb') depends on
	the `pgf' package only.  However, I was unable to compile even a
	simplistic example using the `beamer' class until I've installed
	also the following packages:

xcolor
ifxetex
cm-super

	It makes me ask two questions:

	* shouldn't (some of) the above be added to the list of
	  dependencies?

	* is there a way to list the significant, yet optional,
	  dependencies (like, e. g., the Recommends: field for the
	  Debian `.deb' packages)?