JAL-3447 Satisfactory file associations. cif, mcif and pdb now not opened by Jalview by default -- but are associated. In Windows and linux installer, are deselected by default. 'jalview://' as a URL scheme now associated in Windows and macOS.
JAL-3420JAL-3394 Correct format of XML in added file extensions for install4j8. Also progress indicator for adding file associations (which can be slow). Still not entirely working, see comments in issue.