Updated README file for the coming metafacture-core release.
Updated README file for the coming metafacture-core release.

The README now provides much more information than before. This should make
it easier for new users to get started with Metafacture.

cboehme/metafacture-core,guenterh/mf3SourceCodeEnhancements,dswarm/metafacture-core,culturegraph/metafacture-core,zazi/metafacture-core,guenterh/mf3SourceCodeEnhancements,zazi/metafacture-core,knutwalker/metafacture-core,metafacture/metafacture-core,hbz/metafacture-core,schaeferd/metafacture-core,philboeselager/metafacture-core,hbz/metafacture-core,dswarm/metafacture-core,knutwalker/metafacture-core,cboehme/metafacture-core,knutwalker/metafacture-core,hbz/metafacture-core,philboeselager/metafacture-core,philboeselager/metafacture-core,schaeferd/metafacture-core,cboehme/metafacture-core,zazi/metafacture-core,guenterh/mf3SourceCodeEnhancements,culturegraph/metafacture-core,cboehme/metafacture-core,metafacture/metafacture-core,metafacture/metafacture-core,culturegraph/metafacture-core,dswarm/metafacture-core,schaeferd/metafacture-core