[PD] Value vs receive names

[Krzysztof Czaja]

hi,

I checked value in max, and of course value names live in a different
namespace than send/receive names.  Thus the float method of vcommon
class should not set the variable (as in my fix), but instead, should
be a nop, if we care of maintaining some degree of compatibility.

But anyway, value in max stores any message, this is the main
difference...

Krzysztof