Implemented svn revision support

Added reminder about name -> scancode/keysym mapping

TODO

@@ -3,8 +3,6 @@
  * Add higher precision timers for profiling
  * Implement YUV texture support
    - in progress, software support is done, Ryan is working on OpenGL shaders
- * Put subversion revision in SDL_version.h
- * Tag snapshots with subversion revision
  * Implement desktop video mode change notification?
  * Add diagonal line clipping to SDL_IntersectRectAndLine()
  * Add OpenGL 3.0 context support
@@ -23,6 +21,7 @@
    - http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#KILLINGWINDOWS
  * Add a timeout parameter for SDL_WaitEvent() (?)
  * Implement key repeat at the driver level
+ * Add name -> keysym and name -> scancode lookup functions
 
 Wish list for the 1.3 development branch:
 http://bugzilla.libsdl.org/