Fixed the compiler, got the disassembler working.

Fixed the compiler, got the disassembler working.

* doc/guile-vm.texi:  Texified and cleaned up.
* src/vm.c:  Use `scm_from_locale_string ()' instead of `scm_makfrom0str ()'.
* src/vm_engine.c:  Likewise.
* src/programs.c (scm_program_bytecode):  Return a u8vector instead of a string.
* module/system/vm/conv.scm (make-byte-decoder):  Fixed a few things wrt. to
  the string to u8vector transition.
* src/objcodes.c (bytecode->objcode):  Fixed a bug where the last 10 bytes of
  the bytecode where ignored.
* module/system/vm/assemble.scm (dump-object!):  Don't convert everything
  to a u8vector, keep strings where it makes sense.
* module/system/vm/conv.scm (code->bytes):  Accordingly, convert strings to
  u8vectors when needed.
  (make-byte-decoder):  Accordingly too, when decoding instructions, return
  variable-length instructions' argument as strings except for `load-program'.
* module/system/vm/disasm.scm:  Export `disassemble-bytecode'.

git-archimport-id: lcourtes@laas.fr--2004-libre/guile-vm--revival--0.6--patch-4