Changes

===Backgrund===

===Backgrund===

Due to dependancies, the installation of contribs requires very often the installation of rpms coming from other repositories.

Due to dependencies, the installation of contribs requires very often the installation of rpms coming from other repositories.

Updating the installed contribs needs sometimes to update the dependancies or sometimes only the dependancies get updated.

Updating the installed contribs needs sometimes to update the dependencies or sometimes only the dependencies get updated.

In order to avoid serious problems of compability, it is very important that all the rpms get updated only from the repository they are installed from, instead of only taking the most recent release existing in all the repositories that are available.

In order to avoid serious problems of compatibility, it is very important that all the rpms get updated only from the repository they are installed from, instead of only taking the most recent release existing in all the repositories that are available.

Yum doesn't do this job in one command but small scripts must be used for this purpose.

Yum doesn't do this job in one command but small scripts must be used for this purpose.