[Snek] Snek version 1.8

[Keith Packard]

### Version 1.8

 * Add 'str' builtin. Just like Python, the str builtin converts any
   value to a string.

 * Fix 'chained' comparisons (e.g. a < b < c). These generated
   incorrect code that left the stack messed up unless all comparisons
   were true.

 * Allow 3 * 'a' as well as 'a' * 3. The code for evaluating
   expressions only permitted the string to be on the left side.

 * Add support in snekde for auto-detecting device baud rate between
   57600 and 115200 baud.

 * Add port to the ATMega 328 based LilyPad, in both the regular size
   as well as the big version which replaces the boot loader to gain
   more functionality.


-- 
-keith
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