2.1.x requires >=Python3.5, and current openbabel python RPM uses
Python 3.4

do not import recursively requirements.txt...

swtich order of yum install wget and wget call

this caused a transparent but avoidable JS error

fix #27

see #7

and remove the not requested biochemical tests available filter
see #7

see #7

related to #7

(already removed in other parts of the code to solve #19

fix #18

forgotten while fixing #19

fix #22

fix #26

fixes #24

fix #19

and also simplify the "filters on?" template condition
fixes #20