vendor/nvi2: upgrade from 2.1.3 to 2.2.0

Digest of notable changes from git commit messages:

- fix incompatible behaviour of T
- remove a needless NULL-checks before free()
- fix backward sentence

vendor/nvi2: upgrade from 2.1.3 to 2.2.0

Digest of notable changes from git commit messages:

- fix incompatible behaviour of T
- remove a needless NULL-checks before free()
- fix backward sentence deletion
- fix a few memory leaks and a double free
- prevent erroneous COLUMNS/LINES settings
- add Vim-style expandtab option
- align unprintable chars correctly

For complete "git log" see:

https://github.com/lichray/nvi2/commits/master

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