#139 Update to Allegrocl module

[Mikel Bancroft]

Fixes a number of SEGVs primarily in the handling of
various anonymous types. Found in a pass through the
swig test-suite. Still more to do here, but this is a
good checkpoint.

Adds -cwrap and -nocwrap as an allegrocl specific
command-line argument. Controls generating of a C
wrapper file when wrapping C code. By default only a
lisp file is created for C code wrapping.

Doc updates for the command-line arguments and fixes as
pointed out on swig-devel

[Mikel Bancroft]

diff of patches to Allegrocl module