[Stefan, Jenne]

We removed the PR2 length feedforward that removes the MICH signal in PRCL.  We did this by ramping the PR2 LOCK_L gain at the lowest stage to 0.  We didn't see any change in DARM.  We also tried increasing the gain by a factor of 3.  Again, we didn't see any change in DARM. 

However, since we discovered and mitigated some scattering effects earlier tonight (but after this PR2 test), we should try this again.