Cleanup

- move the development documentation to devel-doc subpackage
- removed obsolete BuildRequires, not needed anymore:
  docbook-xsl-stylesheets doxygen gcc-c++ libxslt perl-Bootloader
  perl-gettext perl-XML-Writer sgml-skel swig update-alternatives
  libtool yast2-installation yast2-packager yast2-perl-bindings
  yast2-pkg-bindings yast2-storage yast2-testsuite
- removed empty agents/Makefile.am
- 3.0.1
Merge pull request #20 from yast/cleanup

Cleanup