Don't exit after the batch compiler is loaded
Disable some exception handlers for better backtraces
Disable the ARENA_LIMIT check for now
Add script to load batch compiler
Fix typo
Separating the conflated compiler's idea of the object file version it generates from the runtime system's idea of the object file version it accepts.
(cherry picked from commit 4aa7ca308abd6d17c91861fdf20002476ed4f480)
Enforce word alignment of C functions
Remove ARENA_LIMIT in reserve_arena_space

Doesn't seem to be needed (at least not yet).
Fix emulation of Time.time

* nj_env.sml (MLWTime): new structure that emulates Time.time with a triple
of three ints.

* change_nj.sml (MLWorks.Internal.Types.time): Use MLWTime.time
* change_nj.sml (MLWorks.Internal.Exit.exit): Just print a message.
Needed so that we can continue to use the batch compiler.

* smlnj-boot.sml: Add the commands to invoke the batch compiler for
  future reference.
Remove debugging code
Remove debugging code
Fix layout
Remove debugging code