BPTX publication on DIP and cogging

Discussion on Massi and Sophie's proposal for BPTX publication over DIP, synchro modes and cogging for startup.

PROPOSAL:
0) use DIP structure proposed in Alick's doc:
   dip/EXPT/LHC/Timing

1) zLocationIP: indeed, change to DeltaT in ns
   Purpose: value for OP/EiC to fine-adjust the crossing point
   Definition: measure arrival time difference of paired bunches
   (i.e. average over all bunch pairs __which are supposed to collide in
   the given IP__ )
   Rate:  1 Hz (or less frequent ?)
   NB: this requires colliding pairs for a given expt to give a value.
   NB: cogging will be verified with proper bunch scheme (with pairs
       that are supposed to cross in IPs. We do not have anymore the
       pressure of last year.)

2) PhaseB1 [ns]: phase difference between B1 (averaged over all bunches)
   and bunch clock used by experiment.
   Purpose: Monitor possible drifts which may lead to non-optimal detector
   signal sampling. Offset to 0 as soon as experiment time alignment has been
   performed.
   Rate: currently 1 Hz, but maybe overkill for drift monitoring.
         0.1 Hz or 1/minute would be enough. No ?
   NB: drifts we are looking for are of the order of 100 ps, therefore
   it is important that the published value be "baseline-subtracted"
   to give a value which is not too far from zero (relative to 100 ps).
   NB: if using BC, this automatically reduces value to <12.5ns,
       and is independent of fill pattern. So, seems more appropriate
       than ORB.

   PhaseB2: same.