Hello,

This patch adds target read/write partial methods.

It's almost ready for prime time.  I want to first see through some 
other target cleanups namely:
+  /* FIXME: cagney/2003-10-15: This code should walk down the target
+     stack looking for a stratum that supports the mechanism.
+     Unfortunatly, there isn't a per-target-stack chain to walk round.
+     Catch-22.  */
and a s/target_ops/target/ transformation.

Note that it includes:
+  /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
+  TARGET_OBJECT_MEMORY
I'm going to need that when implementing a per-target 
CONVERT_FROM_FUNC_PTR_ADDR.

Otherwize, comments?
Andrew