webpivottable uses xsd: prefix to convert types. Without this, measure
dimension is not detected as measure.

Based on https://github.com/abilian/olapy/tree/simple_example_wendelin ,
but using directly numpy arrays for simplicity.

support OPTIONS request, that is needed for https

# Conflicts:
#	requirements.txt

# Conflicts:
#	requirements.txt

# Conflicts:
#	requirements.txt