Allow disabling optimizations for debugging #197
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There needs to be an option to disable optimizations when debugging. This change makes source-level debugging far more accurate and a much friendlier experience.
Dunno if you want to set this build flag automatically when the Debug menu option is "On", so I've left it as a separate option.
The -Og flag is available with gcc in modern versions of Arduino (+v1.6), so it should be safe. The next best (older) flag would be -O0 (disable optimization)