This is a general tidyup to detach this fork better from Gordon, who was (and perhaps still is) completely inundated with WiringPi-related support questions.

This changeset includes a number of tweaks which should reduce support burden on Gordon. I believe they are essential if we plan to release a new debian package.

They should - hopefully - not reduce or make ambiguous the origins of this code while achieving the above.

* Remove Gordon's email address from all source files to avoid support queries finding their way to him
* Update wiringPi URLs to the GitHub repository to try and keep bugs/issues within the fork
* Bump version to 2.70 ready for a debian package release
* Update debian package maintainer info, add bugs & homepage URLs to this repository

A recent compiler complains about the sprintf() in authenticate() being able to
write up to 1023 bytes into challenge, which is not possible given that getChallenge()
returns a string 10 bytes smaller than whatever string is in its 1024 byte buffer.
Reducing the size of the buffer in getChallenge() quiets the warning.  It should not
affect anything else, as the challenge string is used as a salt that must be <= 96 bits.

Added fixed for a few minor things. pin driver for rht03/dht type
sensors. Network stuff is experimental - for now.