Changed built to work marginally better.

and developed the new ISR - Interrupt Service Routine
handler - much easier than the old waitForInterrupt code!

Minor tweaks to the gpio program to recognise the environment variable
WIRINGPI_DEBUG too, and removed the printing of the errors from the
main wiringPi setup routines (and added some new ones!)

delayMicrosecondsHard re-written - again.
Added a serialRead example program, and added in the okLed
to the examples too.
Updated/checked some of the GPIO/PWM code.
Added in some experimental servo and tone generating code and
and example or 2.
Tweaks to the gpio command to correctly load the I2C modules too.

Also Makefile tweaks to help improve things somewhat - decided to
read the Makefile manual after some 15 years to updated my make
grey cells somewhat.

New command in the gpio command - readall

Fixed timing in the LCD library to work with new dealyMicroseconds
Minor typos and bigfixes to the gpio command.

allow access to the wiringPi to BCM_GPIO pin mapping tables.

hardware revision number... So have adapted wiringPi to cope.

accomodate the changes in pin that are present on the Revision
2 Raspberry Pi board.

Added in simple debugging too - set the environment variable
  WIRINGPI_DEBUG
to get some more debug messages out

Changed the gertboard code to use it
and ran more tests on he Gertboard code.

and an example.

code. Seems the old 4011 in the NES controller isn't that fast
afterall!

to pumSetRange() happens.

ANDing with 0x3FF was wrong anyway as the PWM counter does from zero
to the top value, not top-1 as I originally thought.

Conflicts:
	gpio/gpio.c

Updated wiringPi to add new PWM controls.

Added top-level build script for lazy building.

in pinMode ()

General tidying up of some of the code round delayMicroseconds