delete the tutorial

delete the tutorial

* configure.ac:
* doc/Makefile.am:
* doc/tutorial/ChangeLog-2008:
* doc/tutorial/ChangeLog-guile-doc-tutorial:
* doc/tutorial/Makefile.am:
* doc/tutorial/guile-tut.texi: Remove the tutorial. The history was out
  of date (whereas the manual is current), the C examples are no longer
  valid (and the manual does provide C examples), it was incomplete, and
  its first person no longer hacks on Guile. So tutorial, you had a good
  run, but the manual does your job now!