JAL-3065 Change in all repo documentation advising launching Jalview with the -Djava.ext.dirs=LIB option to now use -classpath="LIB/*:..." instead. Using the -Djava.ext.dirs= option masks the JRE's own ext dir which contains the sunjce packages. This manifests as cipher problems when accessing https resources (in particular https://www.ebi.ac.uk/... when searching for PDB structures, activated when choosing Sequence->"3D Structure Data...")