Tidy up comparison doc

Restore original checksums filename

Merge pull request twpayne#1116 from twpayne/fix-1115

Fix upgrade command for older versions

Merge pull request twpayne#1114 from twpayne/misc-fixes

Update dependencies and tidy up internals

Merge pull request twpayne#1095 from twpayne/build-libc-specific-arch…

…ives

Build libc-specific archives

Merge pull request twpayne#1086 from twpayne/upgrade-cmd

Restore upgrade command

Merge pull request twpayne#1079 from twpayne/misc-fixes

Misc fixes

Merge pull request twpayne#1071 from twpayne/windows-default-editor

Use notepad.exe, not vi, as the default editor on Windows

Merge pull request twpayne#1067 from twpayne/release-v2

Update documentation and release process for v2 release

Merge pull request twpayne#1058 from twpayne/misc-fixes

Minor fixes