Something went really wrong with the merge at e0e8c0d3. As a result, changes made by @dave where reverted in the merge. This commit restores those changes

Conflicts:
	wetb/utils/cython_compile/cython_compile.py

Update docs about load envelopes

I've updated the docs to explain briefly the use of the load envelopes

See merge request !2

h2_vs_hs2: added more sensors, more general form of the blade distributed parameters obtained for HAWC2 statistics, other small fixes

hawcstab2: induction output file number of columns depends on the version of HAWCStab2. Assume 38, but fallback to 34