Some infrastructure work, and of course some debug:

Some infrastructure work, and of course some debug:
- TODO: more stuff
- libxslt/transform.c: context position and size in for-each
- libxslt/xsltutils[ch] libxslt/makefile.am: added the util module
  and put Error and Debug routines
- libxslt/xslt.c libxslt/transform.c libxslt/pattern.c: switched
  to use the Debug calls, cleanup
- libxslt/xsltproc.c: added -v to enable debug printing
Daniel