rename tail-call to goto/args, add some more tail instructions

rename tail-call to goto/args, add some more tail instructions

* libguile/vm-i-system.c (call): Rename continuation invocation from
  `vm_call_cc' to `vm_call_continuation', because that's what it really
  does. Add a note that it doesn't handle multiple values at the moment.
  (goto/arg): Renamed from tail-call, in deference to the progenitors, on
  Dale Smith's suggestion.
  (goto/apply): New instruction, for `apply' in a tail context. Not yet
  used, or vetted for that matter.
  (call/cc): No need to pop the program, I don't think; although this
  isn't tested either.
  (goto/cc): New instruction, for call/cc in a tail context.

* module/language/scheme/translate.scm (*forbidden-primitives*): Rename
  from %forbidden-primitives.

* module/system/il/compile.scm (codegen): Adapt to goto/args instead of
  tail-call.

* module/system/il/inline.scm: Start inlining some macros used in
  r4rs.scm -- not yet fully tested.

* ice-9/boot-9.scm: Allow load of a compiled r4rs file.