Moved the extensions into wiringPi from gpio and made it more general purpose
more so that RTB and anything else can dymanically add devices
into wiringPi.
Changes to GPIO to updates for the SPI and I2C module loads
Added gpio unload for SPI and I2C.
Added a new way to setup SPI - by passing the mode in.
Support for the new Pi2 thing too
Added in generic 'blink' programs in the examples in C, RTB and Shell.
Updated wiringPi with a little big-file on the millis() function and
added in a new micros() function too.
Updated the examples with standard LGPL headers.
Added a new isr-osc.c test program - just for ISR timing purposes.
on non Raspbian systems (and even on some Raspbian systems it would appear ):
fixed a timing issue on softTone
fixed some issues in wiringPisetup introduced when optimising the mmap calls.
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!)
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