Changed repository structure, removed GRaNIEdev, various small changes to code,  more changes and preparations follow

GRaNIEdev: Important bugfix for enrichment analyses: Introduced a regression in 0.14 that is fixed now. Thanks to Nila for reporting it

GRaNIE: Important bugfix for enrichment analyses: Introduced a regression in 0.14 that is fixed now. Thanks to Nila for reporting it

GRNdev: Small changes to addData to capture some edge cases for missing data and column names for metadata

Documentation updates

See merge request grp-zaugg/grn!8

GRNdev: Bugfix for summary enrichment slot, now it contains all terms and distinguishes between ontologies