Suggest using OMERO.ij instead of the "Download from OMERO" plugin
Update omero_client.jar to 4.4.8p1

This allows the "Download from OMERO" plugin to work with 4.4.x servers.

Fixes #10770.
Merge pull request #695 from sbesson/rebased/dev_4_4/landingpagefix

Downloads page: use PDF artifact (rebased onto dev_4_4)
merge dev_4_4 -D org -I include -E exclude: PR 673 (Make configuration file suffix configurable)
merge dev_4_4 -D org -I include -E exclude: PR 694 (Properly populate metadata with Zeiss ROIs)
merge dev_4_4 -D org -I include -E exclude: PR 696 (ND2: fix size calculation for lossless compressed data)
merge dev_4_4 -D org -I include -E exclude: PR 698 (Fix "Download from OMERO" plugin for 4.4.x)