Merge pull request #3031 from PaulBoersma/master

download pages for version 6.4.46

Merge pull request #3020 from PaulBoersma/master

download pages for version 6.4.45

Merge pull request #3006 from PaulBoersma/master

corrected GitHub tag to v6.4.44a on download pages

Merge pull request #3004 from PaulBoersma/master

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Merge pull request #2998 from PaulBoersma/master

docs for version 6.4.43

Merge pull request #2989 from PaulBoersma/master

download pages for version 6.4.42

Merge pull request #2979 from PaulBoersma/master

download pages for version 6.4.41

Merge pull request #2961 from PaulBoersma/master

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Merge pull request #2924 from PaulBoersma/master

download pages for version 6.4.39

Merge pull request #2909 from PaulBoersma/master

download pages for version 6.4.38