Avoid avatar URL requests on load of change list

The change list is showing avatars for the change owners. Until commit
f712cdb27c74d8e19f19e3c15c9bbc32069187d2 this never worked since for
the change list the avatar images are requested with size 16px and
displaying of avatar images only worked for the default size which is
26px. Commit f712cdb27c74d8e19f19e3c15c9bbc32069187d2 fixed this so
that the avatar URLs for non-default sizes are fetched from the server
(because only the URL for the default size is contained in account
info). As result we have now one avatar URL request per result in the
change list which is too much load. Fix this by requesting the avatar
with the default size (26px) and then scale it down in the browser
to the needed size (16px). This is the same what we are already doing
in other places where we want to display smaller avatars.

Change-Id: I0df01a1b9c8e0c0332386e471bfe2eb1a94e7889
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
Fix reference to Forge Committer access right in documentation

The access right '+2 Forge Committer or Tagger Identity' in the
'Forge Identity' category doesn't exist anymore, but was replaced by
the 'Forge Committer' access right.

Change-Id: I786579407939b66ec886645fd687220e21ccb04d
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
Merge "Fix reference to Forge Committer access right in documentation" into stable-2.9