How to change revision number for all files of a project?

[Ben Stover]

After adding some files to a certain project they are listed with revision 
number 0
while the other (and still valid) files in CVS repository are labelled 1.7

How can I replace the revision number of the newly added files with a number of 
the already existing files 1.7?

Alternatively: How can I tag ALL current files of a project with the same 
revision number?

Ben