OpenQuake Python3 3.6.5-6

[Matteo Nastasi (@nastasi-oq)]

• Import new version of python 3.6.5 from Ubuntu bionic
• Fixed generation of virtual environment

OpenQuake Python3 3.5.4-4

[Matteo Nastasi (@nastasi-oq)]

• update packager script to support passphrase and bionic sources
• port from 3.5.3 to 3.5.4
• Disabled optimizations
• Add /opt/openquake as prefix and some other changes to the filesystem scheme