Update install instructions to correct downloading the latest release…

… tarball

update version number

Fix upgrade system (mycodo_wrapper). This may have broke the upgrade …

…system (if so, use the manual method in the README)

remove debug line

Fix for HUT21D sensor module (kizniche#172), fix for DHT11 sensor mod…

…ule (kizniche#171). Release 4.1.5.

Fixes, test update (Release 4.1.4)

v4.0.26: Mostly backend changes (update to increment version number)