STE forms a new superpackage

[Mark Tarver]

Willi has pointed out that the STE is scattered over many packages; so I used inheritance to create a superpackage called ste whose external symbols are invoked by (external ste).  Hence it will only be necessary to write 

(package <package name> (append (external ste) <external>)   

<code here>)

to import all of the STE functions into the package.  Altogether there are 289 external functions in the STE.  Most of the kudos to Willi.

I'll put this info into the STE main page shortly.

Mark