xotcl.c

- NsDotVarResolver: don't create variables on CMETHOD frames when their names do not start with a "."
- general overhaul of XOTcl_PushFrame()XOTcl_PopFrame():
new functions:
* XOTcl_PushFrameCsc()/XOTcl_PopFrameCsc(): for CMETHOD fames
* XOTcl_PushFrameObj()/XOTcl_PopFrameObj(): for OBJECT frames
(objscope)

- preallocate obj->vartable in XOTcl_PushFrameObj() to
avoid situations where to non-existing vartable is created
on demand at different places (e.g. on stack and in
var resolver)

- caller of convertToRelationtype(): make sure that last argument
keeping the result is large enough to held pointer (in case of
sizeof(void) != sizeof(int)