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Common mode histogram using algorithm 5

Thoughts from Phil on CsPad Common Mode:

• statistics of unbonded pixels is a problem
• poisson statistics on bragg spots is bigger than the common mode
• don't correct common-mode for low-gain pixels
• the larger shifts seen in bright events are "cross-talk" caused by the "ramp" where pixels nearer the mean-pedestal have a lower gain
• should do per-asic common-mode
• should do algorithm 5, then algorithm 1 if it fails

Summary for CSPAD

Common mode correction for CSPAD works with algorithm #1 and shows significant effect.

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