A memset was used to clear two of the SAUL values in phydat_t::val
The change is to replace that by the following
res->val[1] = 0;
res->val[2] = 0;
which makes the code more obvious.
- cleaned up interface
- made read functions return phyical values
- made resolution configurable at initialization time
- added default parameter configuration file
- added SAUL support for the driver
