[Everyone] dspsr VDIF changes

[Willem van Straten]

Hi all,

Today, I checked in some changes to dspsr that enable it to read VDIF
packets that contain signals divided over more than one frequency channel.

Previously, the number of channels encoded in VDIF packet headers was
interpreted as the number of polarizations and it was assumed that only 1
frequency channel was recorded.  Now it is necessary to specify the number
of polarizations in the ASCII header used to supplement the VDIF data file;
this can be done by adding either "NPOL 2" or "NPOL 1" as appropriate.

This commit also includes some changes that enable dspsr to deal with
missing VDIF packets.

With advance apologies for any pipelines that are broken by the new
requirement, please let me know if anything appears to be broken.

Cheers,
Willem
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