- requireNameSpace: * fix potental crash in requireNameSpace in objscoped methods by swapping all vartable references in objscopes on stack to the vartable in the namespace, when it is created - extending regression test
- renaming of instance variable specific primitiva for more constistency with ::xotcl::importvar: ::xotcl::exists -> ::xotcl::existsvar ::xotcl::setinstvar -> ::xotcl::setvar