2.1.19

  * Add test for attribute IO
  * Add test for basic image IO
  * Add travis-ci build check

2.1.18

   * Correct code for problems discovered by Coverity

2.1.17

   * Add a function to chech whether a file is actually a vista file
     by only reading the header file.
   * replace _SVID_SOURCE by _DEFAULT_SOURCE as the former is deprecated.

2.1.16

   * Revert licenses of type.c and history.c to original by A. Pope
   * Corret licenses in 2dspline.c, 3dfield.c. vcplist.*, vfield2d.*,
	 vfield3d.*, vspline2d.*
   * remove vistaio_change_names.py because it doesn't make much
	 sense to distribute it always.
   * correct license COYPING file to reflect what is given in the
	 source files.

2.1.15

   * correct errors in the man pages

2.1.14

   * support multiarch in build system
   * clean up manpages
   * rename al functions and macros from V* to VistaIO* in order to avoid
	conflicts with libvia from the Lipsia software package.
