fix bug #110577 namespace in copy-of don't obbey the same rules as for

fix bug #110577 namespace in copy-of don't obbey the same rules as for

* libxslt/transform.c: fix bug #110577 namespace in copy-of
  don't obbey the same rules as for literal reusl elements.
* tests/docs/Makefile.am tests/docs/bug-118.*
  tests/general/Makefile.am tests/general/bug-118*: added the
  example in the regression tests for that bug.
* libxslt/variables.c: fixed a bug introduced in fixing #110020
* tests/docs/Makefile.am tests/docs/bug-11[67].*
  tests/general/Makefile.am tests/general/bug-11[67]*: added 2
  regression tests one still exposing a mem leak (Mark Vadoc).
Daniel