[e-lang] Command objects provide no binary access

[Kevin Reid]

The Command objects (from privilegedScope["makeCommand"] /  
org.erights.e.elib.extern.CommandMakerAuthor) have the following flaws:

1. No way to retrieve the command results as binary data.

2. No way to retrieve the results as streams.

3. No way to supply the input as a stream (text or binary).

4. The ability to execute the command promptly ought to be a separate  
authority, since it is unsafe both by causing blocking and by  
receiving outside input inside of a turn. I would suggest that a given  
Command ought to be reducible to an eventual-only facet, and/or  
provide two different constructor methods on makeCommand.

-- 
Kevin Reid                                  <http://switchb.org/kpreid/>