SCAMP update

Added support for the Gaia-EDR3 astrometric reference catalog (still without proper motions).
Fixed errors with gcc -fno-common option (gcc10 default).
Made management of flags more consistent (unsigned short for SCAMP, SExtractor and weight flags; unsigned int for imaflags).
Changed default Python version for tests to 3.

v2.9.2: Fixed regression with proper motion output units.

Field (de-)rotation during translation now takes partially into account PV distortions.
Increased 2nd peak minimum distance from 1st peak in MATCHing peak finder to accommodate "dirty" correlation peaks.
Added gentle regularization of astrometric solutions.
Fixed crashes happening with some malformed command lines.
Fixed number agreement in information display.
Turned off auto-vectorization of the weighting loop in update_samples() to bypass an INTEL bug.

SCAMP update

Improved re-projection engine
Astrometric solutions now include a simple regularization scheme

v2.6.7

Added PanSTARRS-1 astrometric reference catalog.
Fixed segfault when using large input "@"lists.
Restored initial ordering of fields after field grouping.
Fixed issue with decreasing MATCHing contrast in large sets.
DATE-OBS date and time now taken into account in epoch computation.
Pushed the hard limit for the number of references sources in Vizier queries to 100,000,000 per group
Fixed valgrind warnings (nothing critical)
Added --with-release configure option for setting package release number.

First Github release

v2.6.2

Fixed valgrind warning in field management functions.