The OCaml module's exception handling code was poorly designed,
gave confusing exception messages, and was vulnerable to buffer
overflows.
The OCaml module's SWIG_exception_() was adding a useless newline to
the end of the exception message.
In some cases, the integer value of f.e. SWIG_TypeError was being added
to the exception message.
The unneeded else in the OCaml module's SWIG_contract_assert() macro
was causing -Wmisleading-indentation warnings.
The OCaml module's exception handling code now mirrors that of the
Java module.
Add Lib/ocaml/std_except.i.
Add multiple runtime tests.
