OpenOCD commands w/prefix ocd_ now set the primary Tcl return value instead of messin...

OpenOCD commands w/prefix ocd_ now set the primary Tcl return value instead of messing with ocd_output local variable. Much more straightforward and expected behaviour. The side effect is that the ocd_xxx commands will print output twice(once immediately and once upon completion of command). This is a strange, expected and intentional behaviour.

git-svn-id: svn://svn.berlios.de/openocd/trunk@871 b42882b7-edfa-0310-969c-e2dbd0fdcd60