Modified USART configuration to run at 19200 baud.
Initial code for interrupt-driven transmitting.
Changed Timer1 setup to run at 10ms period.
Timer1 thread sends an incrementing byte over UART.
Updated Timer1 and USART1 initialization to work with 26J50.  Also have received UART bytes being displayed on PORTB as they appear in the buffer.
Renamed "uart_recv" functions to "uart_rx" to match "uart_tx."
Moved UART Tx initialization into uart_init_tx().  Combined uart_init_tx() and uart_init_rx() into a single uart_init().  Renamed members of __uart_comm type to be more descriptive and added comments at their definitions.
Removed uart_init_rx() because all it was doing was initializing the UART data struct - this is now part of uart_init().  Added placeholder function and data struct members for a transmit driver.
Updated UART data struct member comments to javadoc-style.  Fixed prototype name for uart_init().
Initial version of UART Tx driver.