syntax parameters implemented properly

syntax parameters implemented properly

* module/ice-9/psyntax.scm (resolve-identifier): Take an additional
  argument, indicating whether syntax parameters should be resolved or
  not.  Just return three values: the binding type and value, and the
  module for resolving toplevels.
  (chi-install-global): Take an extra arg, the type.  If we are defining
  a syntax parameter, construct a pair for the binding.
  (chi-body): Syntax parameters now use a per-parameter unique value (a
  pair) as a key in the expansion-time environment `r'.
  (syntax-parameterize): Don't allow parameterization of
  non-parameters.  This is an incompatible change, but it is for the
  better; you don't want to allow users to parameterize `lambda', after
  all.