added an additional variant of ALLOC_ON_STACK The new version does not use alloca(), it does not use VLA and it does not boat the stack in case huge vectors are to be processed. It uses a plain array up to a certain size and switches to malloc() above this size.
- improved error message "not allowed to have default": make clear, this is from a parameter specification - added object property "autonamed" (set automatically for objects created via "new") - xotcl2 volatile: improved backward compatibility with XOTcl 1 - extended regression test