[Everyone] PSRCHIVE performance improved on PSRFITS files

[Willem van Straten]

Hi everyone,

Today, I checked in a couple of changes to PSRCHIVE that should increase
PSRFITS I/O speeds by around 50% to 60% (depending on the file system and
file size).  A report on the investigation that led to these changes is
available for comments at


 SP-1300 Report on PSRFITS I/O Performance
<https://docs.google.com/document/d/1bHRyUF5BOvN64PgpOclXOfvvCUyZ8iuywodnBjXsPs0/edit?usp=drive_web>


Only two of the changes attempted in this study have been incorporated into
the latest version of PSRCHIVE.  The changes committed today are described
under

   1. "Report on NZAPP-256" sub-heading "Updated PSRCHIVE"; and
   2. "Report on NZAPP-258" sub-heading "Remove call to psrfits_set_rows,
   ..."

These changes are fairly straightforward and fairly well tested, but please
let me know if you see anything strange after updating your PSRCHIVE
installation.

Cheers,
Willem
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