since they're so similar (AFAICT), I think it'd be better if solvedeps occurred 
in the --help output right after whatprovides and had its description change 
to "same as solvedeps, but downloads and installs the packages as well".  I 
like this better than entering an RFE bug against --solvedeps that it doesn't 
mention that the list is comma-separated like whatprovides does :)

[SNIP]
  --solvedeps=<deps>          finds, downloads, and installs the packages
                              needed to solve the list of deps
  --tmpdir=<directory>        where to store temporary files / RPMs
  -u, --update                update system with all relevant packages
  --version                   show program version information
  -v, --verbose               Show additional output
  --show-channels             Show the channel names along with the package
                              name where approriate
  --whatprovides=<deps>       shows the packages which solve the comma
                              separated list of deps
[SNIP]