- Implemented P6 instead of P3 ppm mode, since P6 seems to be more
   widely supported by software.

 - Added french localization messages (thanks to Eric Forgeot).

 - Raised version number to 0.2.0-b4.

 - Wrapped IO into filesys_interface.

 - Added pthread-library to drilbo-dependencies.

 - Implemented "get_drilbo_version".

 - Implemented install-dev.

 - Implemented handling of DEV_INSTALL_PREFIX.

 - Renamed "libdilrbo.txt" to "libdrilbo_i18n.txt".

 - Adapted libdilbo to pkg-config.

 - Raised version number to b2 for libpng 1.4 compatiblity and XOpenDisplay
   fixes.

 - Added conditional compile branches for libpng versions >= 1.4.

 - In case XOpenDisplay does not succeed, just return -1 and don't exit()
   any longer.

 - Raised version number for close-window fixes, libdrilbo.mk creation,
   install path modifications, correct locale installation, inline image
   display and many minor fixes.
 - (Second raise due to forgotten 0.2.0 increment.)

 - Raised version number for close-window fixes, libdrilbo.mk creation,
   install path modifications, correct locale installation, inline image
   display and many minor fixes.

 - Implemented scaling for image to output, in case parent window is too
   small to display image 1:1.

 - Fixed comment typo.

 - Added forgotten XFlush after deletion of image window.

 - Added removal of libdrilbo.mk to Makefile in distclean target.

 - Implemented creation and installation of libdrilbo.mk.

 - Added reference to original code from Mark Howell. Thanks!

 - Changed path to install to $(HOME)/opt/fizmo as long as we're in beta.
 - Disabled tracing by default.

 - Made Makefile avoid trying to copy locales/xx_xx/CVS directory to
   installation destination.

 - Cleaned up default .mk files.

 - Removed erroneously checked-in "drilbo-test" binary from repository.

 - Added inline image test.
 - Implemented "setup_callback" and "wait_for_callback" functions,
   allowing the test main to re-use the code.
 - Adapted "display_zimage_on_X11" function to new parent window parameter,
   using own XTerminal window id if present for the inline test.

 - Implemented "parent_window" parameter in "display_zimage_on_X11"
   function, allowing parent window to be specified.
 - Implemnted centering of image in non-root parent window.

 - Altered "display_zimage_on_X11" function to include "parent_window"
   parameter which allows specifciation of the parent window to be used.

 - Added test images using binary import.