Add semantics to support memwrite(32,16,8) with an array2mem command
Move the global up in bits2bytes.tcl so the set puts the value in the global
context.
Add memwrite procs to memory.tcl

git-svn-id: svn://svn.berlios.de/openocd/trunk@786 b42882b7-edfa-0310-969c-e2dbd0fdcd60