Complete check for mass position channels

closes #298

• ABC is a configuration error. Will be removed
• Separate in to group 123, UVW; 456, ENZ to give warning if there's some channels in a group not exist. Notice a swapping between UVW and ENZ
  • If none of 123, UVW detected it will give warning "Did not find mass-position channels 123 or UVW."
  • If none of 456, ENZ detected it will give warning "Did not find mass-position channels 456 or ENZ."