* libi2c/Makefile.am, libi2c/Makefile.in, libi2c/libi2c.c,
libi2c/libi2c.h: New files.
* Makefile.am, configure.ac, preinstall.am, wrapup/Makefile.am: added a
simple API/library for i2c devices and drivers for i2c 2-byte eeproms
and a ds1621 temperature sensor; API is documented in libi2c.h