write(), print(), println() now return size_t (and don't use negative values to signal errors).
Print adds writeError() for checking for write errors, clearWriteError() to reset the flag to false, and a protected setWriteError() for signalling errors.
http://code.google.com/p/arduino/issues/detail?id=598
Mellis asked about in preparation for integration into core:
1. Remove notion of library version
2. Remove little used "enable_timer0" method.
3. Rename is_listening to isListening
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:insert
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:set showmode
