Initial Arduino Mega support.

The Arduino Mega 2560 is now supported in addition to the regular
Arduino.  The Mega supports 8 channels and 7k samples. The ols.profile-*
files are device profiles for the alternative SUMP client. 'AGLA' =
Arduino 'AGLAM' = Arduino Mega

README

@@ -12,19 +12,31 @@ crystal oscillator pins.
 Uncomment CHAN5 below if you want to use the LED pin as an input and have
 6 channels.
 
+On the Arduino Mega board 8 channels are supported and 7k of samples.
+Pins 22-29 (Port A) are used by default, you can change the 'CHANPIN' below
+if something else works better for you.
+
 NOTE:
+If you are using the original SUMP client, or using the alternative client
+without the device profiles, then you will get a "device not found" error.
 You must DISABLE the Arduino auto reset feature to use this logic analyzer
 code. There are various methods to do this, some boards have a jumper,
 others require you to cut a trace.  You may also install a *precisely*
 120 Ohm resistor between the reset & 5V piins.  Make sure it is really
-120 Ohm or you may damage your board.
+120 Ohm or you may damage your board.  It is much easier to use the
+alternative SUMP client referenced above.
+
+The device profiles should be included with this code.  Copy them to the
+'plugins' directory of the client.  The location varies depending on the
+platform, but on the mac it is here by default:
+/Applications/LogicSniffer.app/Contents/Resources/Java/plugins
 
 To use this with the original or alternative SUMP clients,
 use these settings:
 
 Sampling rate: 1MHz (or lower)
 Channel Groups: 0 (zero) only
-Recording Size: 1024 (or lower)
+Recording Size: 1024 (or lower), 7168 (or lower) for the Arduino Mega
 Noise Filter: doesn't matter
 RLE: disabled (unchecked)
 
@@ -33,5 +45,5 @@ below 1MHz.  1MHz works for a basic busy wait trigger that doesn't store
 until after the trigger fires.
 Please try it out and report back.
 
-Release: v0.03 March 7, 2011.
+Release: v0.04 August 3, 2011.