renamed a few directives

#install is as it was before, it always sends the file content
#require sends the file content only if not yet done so (in this session)

wording now conforms to forth 2012.


git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1521 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Website updates

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1522 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Merge branch 'hq'