Add new helper AUTODOC_OutputTextFile
Revise how we hook into the package loading process

This uses namespaces (thus this will work only with GAP 4.5 or later),
but has the advantage that it will work even with packages that have
cyclic dependencies (such as e.g. between Alnuth and polycyclic).
Added a tutorials file in documentation.

This file is not included yet.
Added correct commands to tutorial file.
Added richt commands to file.

Does not work like it is at the moment,
since <Include> commands are evaluated by GAPDoc
in the verbatim enviroment.
Regenerate documentation
Included first tutorial.
Removed unnecessary doc files.
Merge branch 'master_save'

* master_save:
  Included first tutorial.
  Added richt commands to file.
  Added correct commands to tutorial file.
  Added a tutorials file in documentation.