Merge pull request #1214 from w3c/rec-2020-tweaks

Upstreaming tweaks applied to the REC

Merge pull request #1179 from w3c/prof-3PWD-Issues

Prof 3 pwd issues

Merge pull request #1114 from w3c/davebrowning-patch-1

Fix to link

Merge pull request #941 from w3c/andrea-perego-dcat-profile-issue

DCAT: Fixing inconsistent use of "profile" / "application profile"

Added text with details about main changes since FPWD - required for …

…2nd PWD publication

Diagrams to support discussion of catalog membership options