Bugs list; update TODO

Subversion-branch: /trunk/chocolate-doom
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+* Mouse does not move properly. 
+
+  Under MSDOS, the mouse moved according to the acceleration settings
+  in the mouse driver.  Under SDL, the mouse is measured more directly,
+  and acceleration effects are not included.  As a result, the mouse
+  moves slower under chocolate doom (it may be harder to quickly "whip"
+  the player round for example). This needs some investigation to see
+  how mouse acceleration was typically performed under DOS.
+
+* Sound may not set volumes correctly.
+
+  It is possible that volume of sound effects does not scale properly 
+  with distance from the sound source.  This needs further investigation.
+
+* Music plays back differently.
+
+  The DOS music code was not in the Doom source release as Doom used
+  a proprietary sound library.  The mus <-> mid conversion mostly 
+  works well but some patches are different.  By closer examination 
+  of which MIDI instruments are used by doom.exe, it may be possible
+  to get a closer conversion.
+