Improve and simplify handle_bp_command and handle_rbp_command:

- Bug fix: return syntax error if remove called without one argument.
- Use parse_u32 to ensure address and length arguments parse properly.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2235 b42882b7-edfa-0310-969c-e2dbd0fdcd60