Python version can not be passed to installer

[DStrelak]

When running installscipion -conda -dev ~/git/scipion3 -httpsClone -j 8 -n scipion3 -sciBranch devel -xmippBranch devel, the python version for the new environment cannot be set. In my case, 3.8.3 has been installed (probably because my base python version is 3.8.2), which is not compatible with e.g. opencv package, and it cannot be changed afterwards due to number of conflicts.

[azazellochg]

conda will install latest python 3 that it supports. It has nothing to do with system python.

[pconesa]

we need to limit this to at least python 3.8 with 3.9 I've seen it crash.

[pconesa]

in conda envs, it is now forced to 3.8