Removed copied 'cores' and 'variants'. The boards.txt file now refers to the ones included with the Arduino installation.
Updated 'optiboot' source to match the latest head from http://code.google.com/p/optiboot/source/checkout (rev 4c68314d6b15eae1bad09dd4591e630f367cd679).
Reintroduced changes to the Makefile to build the Babyduino bootloader images.
Updated the generated files with the output from the most recent changes.