Introduce Boot wrapper for GET-IO-INDEX-STREAM.

git-svn-id: svn://svn.code.sf.net/p/open-axiom/code/trunk@2974 f499efd5-9937-0410-b36a-d3739c31ded8
Support --output in compiler, for bootstrapping stage.


git-svn-id: svn://svn.code.sf.net/p/open-axiom/code/trunk@2975 f499efd5-9937-0410-b36a-d3739c31ded8