More spell checking of all source files -- correct missed errors, switch to EN-GB spelling dictionary.

Update all demos, projects and bootloaders to indent all function parameters, one per line, for better readability.

Add missing const qualifiers to the demos.

Reduce prescaler of the flush timer in the USBtoSerial demo, so that buffer overruns will not occur regardless of hardware and baud rate settings.

Alter the ring buffer library headers to have both atomic and non-atomic insertion/removal routines. Modify the existing projects so that buffer operations performed in an ISR use the shorted non-atomic versions, as they are already performed in a blocking ISR.

Alter USBtoSerial demo so that it does not enter a blocking loop to send data from the USB to the USART, as this can cause dropped bytes in the reception code if large amounts of data are sent in both directions at the same time. Added a flush timer to the USBtoSerial code for the USART to USB interface, so that multiple bytes can be sent in the same USB packet.

Add glitch protection to the software UART in the XPLAINBridge project code, so that very short glitches on the RX line don't cause a frame reception to occur.

Major changes to the XPLAINBridge software UART code for performance and reliability. New code reduces the number of missed characters and misread characters.

Make XPLAINBridge serial bridge much more reliable for the reception of characters from the XMEGA through the software UART interface.

Maximise the size of the ring buffers in the Benito/XPLAINBridge/USBtoSerial projects, so that they should never become full under normal conditions.

Spell check code and manual pages. Remove custom Doxygen CSS stylesheet, as the new 1.7 Doxygen's default stylesheet is much better.

Oops - light weight ring buffer documentation used \ref instead of \param to document function parameters.

Replace ring buffer library in Benito and USBtoSerial projects with the new lightweight ring buffer header to improve reliability.

Switch software UART over to timer 1 and remove timer prescaling to try to prevent integer rounding errors and thus minimize the possible error of the UART code.

Rename software USART driver globals to make the code more in line with the rest of the XPLAINBridge project.

Make software USART used in the XPLAINBridge project directly check and store into the ring buffers, rather than polling from the main program loop to avoid added latency.

Create a new LightweightRingBuffer.h header file for the XPLAIN project to abstract out the new ring buffer without a performance penalty.

The RingBuff library code has been replaced in the XPLAINBridge project with an ultra lightweight buffer to help  improve the reliability of the bridge.

Add svn:eol-style property to source files, so that the line endings are correctly converted to the target system's native end of line style.

Started implementing the low level PDI protocol in the AVRISP project, for XMEGA device programming.

Add new more reliable software UART for the XPLAINBridge project by David Prentice and Peter Danneger.

Removed John Steggall's software UART code from the XPLAIN Bridge project due to reliability issues.

Enable pullup on the PD5 pin of the AVR in the XPLAINBridge project - this is connected to the XMEGA's /RESET line, need to enable pullup to prevent spurrious resets.