Better detection of the DHT11 sensors. Read DHT11 with errors detection and reapeated tries.

Work to move dht userspace code to kernel module.

Running threads and locking doesn't depend on wiringPi anymore.

All thread locks from wiringPi to standard pthreads.

Added MIGRATION document. Trying to drop usleep() call to replace by nanosleep(). Some code cleanup.

Updates for DHT11 reading

Impoved SDL configure checks

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mercurial