DOC/RF/ENH: Enhance docs, change threading for olfactometer
DOC/RF: Try to fix doc building on RTD
DOC: Remove attribute docstrings

Properties are now only documented in their definitions,
not in the class attributes section anymore, to get nicer
Sphinx output.
Merge branch 'doc' of https://github.com/hoechenberger/pphelper into doc
DOC: Fix property docstrings