presence of HIMAWARI_FORCE_FORMAT_V1P2 environment variable turns this off and uses old rad_m and rad_b
a warning will be presented if this override is used
old values will be transposed into bt_c2 and rad_c0 in the calibration query API if new values are used

basically this will warn for anything but HSD FLDK scenes currently

had to both invert sf/ao and the value itself,
since sf/ao are removed during netcdf storage

PUG has negative y north of equator

python -m himawari.ahi2cmi -vv -d $HOME/Data/himawari/sample_bz2/HS_H08_20130710_0300_B16

Path, Value, Dimensions, Attributes approach
see goesr.rockfall.nc_write et al
requires much testing, but once it works we can use goesr SCMI generator with minor modifications

this correctly detects 10bpp and 1023 sentinel
still would like confirmation that this data even has a sentinel