Print the names of the installed packages too

Allows to remove quickly any already installed package that has not been
completely specified from the list of packages to install.

This should make Yum invocations much shorter, often without any
"install" line at all.  It should also make the "spare_dependencies"
method much faster, since it will do much smaller queries.
Add a simulation of how to reduce transactions
Merge pull request #61 from piojo/smaller-transactions

Reduce the size of the transactions