RAM efficiency refactoring, pointed out by RKuehn

Regenerate .gxx code to propagate into compiled library.
(cd include; python2.7 ../himawari/ahi_hsf.py --cxx)
In response to issue #30.

Technically optional since we only require this for GOESR MESOs

optional attributes and filename fixes

bash go.sh v20171016

This reverts commit df6f1d2a.

this is at least present in the test data

results in ~964M B03 going down to ~164M