do not reload a modified block.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1635 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
LIST commands in various formats.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1636 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
LOADing and chained LOADing of screens

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1637 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Merge branch 'hq'