[Halld-pid-upgrade] Log book for PID-Upgrade

[Yi Qiang]

Hi,

A log book has been set up for PID upgrade study. It will be the a place 
for us to keep track of all information and R&D progress:
https://halldweb1.jlab.org/elog-halld/PID_Upgrade/
The logbook is open to public to view, but one needs to register first 
to post new logs:
https://halldweb1.jlab.org/elog-halld/PID_Upgrade/1
You can also subscribe the logbook to receive the latest updates.

Cheers,
Yi