add fallbacks to utf-8 if default OS encoding fails on import or export
avoid crash due to bad field name modifiers in a math field
fix bug preventing 2nd try password from working to open an encrypted file
increase printed line width
update documentation files for the next release
update web pages for the 3.1.4 release
fix error message when a dialog is focused after closing an extra window
fix Python 3.9 problem with array.tostring() in p3.py