Subdirectory processing.
Add onlp_sysi_platform_manage() interface.
Floating point values will no longer be used for temperature and power readings.
All values will be standardized as integers in thousandths of a unit:
- Temperature in millicelsius
- Voltage in millivolts
- Current in milliamps
- Power in milliwatts.

The floating-point members will be removed after all platform code is ported.