Bndtools 2.1 release

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
point at the actual 2.1.0.REL build of bnd

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Correct the syntax of adding a Maven repository
whatsnew: Copy 2.1 info to a permanent page name
whatsnew: Initial 2.2.0.REL whats new page

This is slightly modified copy of the 2.1.0 page and news further work.
Delete whatsnew2-2-0.html

Fix bndtools/bndtools#668. We agreed to use wiki pages for release notes.
Merge branch 'master.old'

So that we don't lose the commits hidden by the non-fast-forward push

* master.old:
  Delete whatsnew2-2-0.html
  whatsnew: Initial 2.2.0.REL whats new page
  whatsnew: Copy 2.1 info to a permanent page name
  Correct the syntax of adding a Maven repository
  point at the actual 2.1.0.REL build of bnd
  Bndtools 2.1 release