Original commit message from CVS:
* docs/README:
* docs/manual/intro-basics.xml:
* docs/manual/intro-preface.xml:
* docs/manual/manual.xml:
* docs/pwg/advanced-dparams.xml:
* docs/pwg/intro-basics.xml:
* docs/pwg/intro-preface.xml:
* docs/pwg/pwg.xml:
describe dparams (controller) for plugins
unify docs a little more