r23747: Move formatting of a parameter's value into a value string

r23747: Move formatting of a parameter's value into a value string
to a function of its own. (for storing it in registry),
Eliminate the valtype variable : store everything as "sz".
Eliminate some trailing white spaces on the way.

Michael
(This used to be commit 76f4f224aa65b1414222818996e215ec80d117a4)