Documentation updates

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1603 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
ROLL from CORE EXT

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1604 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Merge branch 'hq'