the key command_*() helper functions, fixng the bugs that turned up.

Several of these bugs were from misuse of PRIi64; that's for 64-bit
integers, NOT for "long long" or "u64" (which work best with %lld).


git-svn-id: svn://svn.berlios.de/openocd/trunk@1873 b42882b7-edfa-0310-969c-e2dbd0fdcd60