[CM] profile: prepend namespace to the function name

[bil at ccrma.Stanford.EDU]

The profiler now returns the local let-name, if any,
and the function location (file name and line-number)
to scheme via (*s7* 'profile-info).  (*s7* 'profile-prefix)
identifies the name used for the local let name. Also
each separate function in the source now has its own
info.  I haven't yet included the file/line stuff
in profile.scm.