Added gamma table support and brightness / contrast emulation via the gamma

-table to the avision backend. Additional code clean ups ...
Added my new e-mail address to the AUTHORS file.

ChangeLog

@@ -1,3 +1,9 @@
+2000-11-14  Rene Rebe <rene.rebe@gmx.net>
+	* backend/avision.[h,c]: Added gamma table support in hardware.
+	  Brightness and contrast emulation via the hardware gamma table.
+	  Code cleanup.
+	* AUTHORS: Changed my e-mail address.
+	
 2000-11-13  Henning Meier-Geinitz <hmg@gmx.de>
 
 	* Makefile.in: Install sane.h and saneopts.h only.