Better auth error messages

CFHT size (#151)

* CADC-9555 - avoid where possible reading the entire FITS files into memory.

Reduce memory footprint when processing FITS files.

Lazy load of the FITS files headers.

Flag POSTs as idempotent so that they can be automatically retried on certain errors

Mark caom2repo POSTs as idempotent (#149)

* Mark POSTs in caom2repo as idempotent so that the requests can be automatically re-retried on certain failures

Improved reliability

Improved reliability: archive.gemini.edu/fullheaders/ will sometimes return 403

Added code to prevent race conditions in visitor

Ensure that the visitor updates the observation that it reads from the server. For that, it sends the checksum of the original observation that it updated. If the observation was updated on the server in the meantime, the post fails and cadc-tap reads and updates the observation again.

Fixed edge cases revealed by CFHT

caom2utils=1.6.1

Update setup.cfg

Small fixes to accommodate CFHT edge cases

CADC-9033 - edge cases exposed by CFHT. (#140)

* CADC-9033 - edge cases exposed by CFHT.

Added support for HISTORY keyword

Other bug fixes

BluePrint supports observation updates

caom2utils=1.5

s2766 - make it possible to preserve Observation- and Plane-level met…

Added support for CAOM2.4

caom2utils=1.4.6

Update setup.cfg