[fitsbits] WCSLIB 6.4 releaed

[Mark Calabretta]

Greetings,

WCSLIB 6.4 is now available:

   ftp://ftp.atnf.csiro.au/pub/software/wcslib/wcslib.tar.bz2

This release fixes a problem with an the sharable library introduced
in the previous release, as per the change log appended below.

Mark Calabretta



WCSLIB version 6.4 (2019/08/15)
-------------------------------

* Installation

  - The rule change to the Fortran makefile in v6.3 to add getwcstab_f.o
    to the sharable library causes it to depend on CFITSIO to resolve
    fits_get_wcstab().  Hence backed out of that change.

* User manual

  - Documentation generation moved to doxygen 1.8.16 (was 1.8.14).