Merge pull request #1741 from iglesias/develop

Minor updates to dimension reduction notebook
Fixing deprecated functions in .R-files
‘real’, ‘as.real’ and ‘is.real’ were long-deprecated synonyms for the ‘double’ versions.
fix trailing whitespace
Merge pull request #1742 from besser82/fix_R

Fixing deprecated functions in .R-files
fix memory leak/erros in run_system
update news to 3.0.1