* sz4: fixes here and there

* acinclude.m4: add --disable-cgal flag to configure so it is possible
to disable cgal explicty - unfortunately it is not possible to run
draw3 under valgrind with cgal linked in, cgal has internal assertions
that verify if floating point arithmetic is working well enough,
and apparently valgrind is not providing good enough emulation
* wx/draw3/database.cpp: small fix
* resources/Makefile.am: small fix to make install