Zonation 5 v2rc4 (Release Candidate) software upload

Second version of Zonation 5 software release: this is a release candidate for review, official release to be found in github. This version introduces as new features, among other things, the modules for environmental impact assessement and scenario analysis. Also the multi-action visualization tool.Downloadable files include:- Windows installation for executables- Linux installation for executables- Documentation, sample setups and example data- code will be made available with the v2.0 official release (this is release candidate primarily for review purposes)