- Implemented defpos for multiple motors

- Implemented automatic backup on parameter change
- Implemented silent restore
- Cleaned a couple of unused flags from connection object

doc/user/sanscom.htm

@@ -38,9 +38,7 @@ will not do a trick.
 position name. Afterwards this position can be reached by typing: COP name.
 <DT> COP defpos name mot val mot val ....
 <DD> this command defines a named position named name. This must be followed
-by a list of motor names to run and their values. The motor names must be
-those listed as <a href = sanslist.htm>SANS motors </a>. (Not yet
-implemented).
+by a list of motor alias names to run and their values.  
 <DT> COP drop name
 <DD> deletes the named position specified as second parameter.
 <DT> COP axis = val axis = val ........