Version 0.4.0 of PAL

New routines ported from SLA: palRefv, palAtmdsp
New routine inherited from SOFA: palRefcoq

Minimum SOFA version now 2013-12-02

palObs: Now includes telescope positions for APEX and NANTEN2

The autotools build scripts now require autoconf version 2.69.

Thanks to Github user @nega0 for some BSD build fixes.

A subset of the routines have been relicensed using LGPL to allow them to be included in the AST library. Thanks to Patrick Wallace for giving this permission.

A paper on PAL has been published at ADASS: http://adsabs.harvard.edu/abs/2013ASPC..475..307J

This is PAL v0.3.0

Add refraction code and support palOap and palAop. For closer compatibility with SLA for testing purposes the refraction routines internally use clones of slaNutc, slaEqeqx, slaGmst and slaGeoc. Once the code has been verified further the PAL/SOFA routines will be used instead. Switching routines seems to change the results in palTest by about 0.05 arcsec.

v0.2.0

Improve configure script when not in a Starlink build environment. Use

./configure --prefix=/path/to/install

when Starlink is not available and add --without-starlink if Starlink is present but should not be used.

v0.1.5

Explcitly look for libm rather than relying on SOFA to pull it in.

v0.1.4

Check for isblank() function and fall back if it is missing.

v0.1.3

Improve copysign() detection.

v0.1.2

Check for copysign() C99 function and fall back if it is missing.

v0.1.1

The palDrange function has been modified so that it now returns +PI if the supplied angle is +PI (previously, it returned -PI in these cases).

v0.1.0

Initial release with sufficient SLALIB API for [Starlink](https://github.com/Starlink/starlink Starlink) AST and the Astro::Coords perl module.