Factor almost identical, large assembly routines to save code space.

Introduce the 0= and d0= words to simplify other compare operations.


git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1427 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Minimize changes to git-svn
Merge remote-tracking branch 'git-svn'