Some modiications in generating erratas and in names of packages.

Removed 'elfake' from package name.
Changed errata's 'Type' and 'Date' fields to be random as well.
If '-m' option is specified, then generate at least 1 new version of package and generate only one errata for the latest version of package.
Corrected putting the package version value for errata in 'updateinfo.xml'.