User visible changes:

tunnel version 1.2 (16 March, 2004)

* improve mouse handling
* add mouse wheel support


tunnel version 1.1 (4 March, 2002)

* works if there is no audio device available
* added mouse support


tunnel version 1.0 (29 November, 2001)

* changed almost all colors (the background is still black)
* panel text is larger
* much smoother looking tunnel
* added pickups
* levels are now stored in an options file
* added monsters at end of each level
* added new weapons
* added a screen to show the game is paused, or that a new game is
  pending
* added a frame in the game screen
* configurable key bindings
* command line options
* can be installed in its own directory tree
* better win32 support (using i386-mingw32msvc)
* added manual
* changed splash screen


tunnel version 0.5 (14 September, 2001)

* audio support
* exits gracefully on errors instead of crashing
* simpler options file


tunnel version 0.4 (20 July, 2001)

* changed version scheme
* switch to autoconf
* anti-aliasing for all balls
* add alpha to balls so that you can see through your ball
* splash screen showing you key bindings
* it is now possible to play multiple games without having to rerun
  program


tunnel version 20010208 (8 February, 2001)

* multiple weapons
* scoring
* anti-aliasing for panel text and numbers


tunnel version 20001010 (10 October, 2000)

* panel on the side indicating depth, time, velocity, strength and
  hardness


tunnel version 20000913 (13 September, 2000)
First release

* a ball going down a tunnel and firing at other balls
