Task #5844: COBALT PVSS: zero dynarrays pre-obs (while also logging obs ID, data product names, etc). This is nice to have, because some events are written conditionally. If a subband has no dropped data, it's better to init that value to 0.0f. Some minor cleanups related to PVSS event logging is also included.

Task #5830: write CobaltOutput data points using the MACIO RTmetadata interface. Perhaps, the 'dropping' data point is written too late. Also adapt up 2 test cases + createHeaders.cc with RTmetadata dummies that won't try to log/send anything.

Task #4625: Forward LTA feedback from OutputProc to GPUProc using the control stream (instead of the logs), and write the LTA feedback to disk in rtcp.cc

Task #4270: Created Cobalt package under RTCP, containing GPUProc, InputProc, OutputProc (copy of Storage), and the OpenCL FFT libraries

Major code cleanup.

bug 1362: print written/dropped stats at end of obs in Storage, and reduced block reading message to DE
BUG level

bug 1362: split polarizations/stokes over multiple files, rearrange their internal data order, provide proper filenames for each data product (called "subbeam" for now)

Bug #1011: catch SystemCallExceptions, print a warning and continue. We also print a warning in the destructor to increase the chances of it being noticed.