ENH: Specify minimum allowed python version
ENH: Specify minimum allowed python version

When searching for python installation, ensure that a supported
version is found.

richardbeare/ITK,hjmjohnson/ITK,Kitware/ITK,BRAINSia/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,hjmjohnson/ITK,Kitware/ITK,richardbeare/ITK,BRAINSia/ITK,thewtex/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,hjmjohnson/ITK,thewtex/ITK,thewtex/ITK,BRAINSia/ITK,BRAINSia/ITK,hjmjohnson/ITK,thewtex/ITK,Kitware/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,thewtex/ITK,thewtex/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,Kitware/ITK,hjmjohnson/ITK,thewtex/ITK,richardbeare/ITK,richardbeare/ITK,richardbeare/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK