Vim: set nojoinspaces, splitbelow, and splitright

I am hoping that these settings will make my Vim experience a little
smoother.

nojoinspaces: When joining, I never want *two* spaces after punctuation.
This setting prevents this from happening.

splitbelow and splitright: These settings will cause Vim to open
horizontal splits below the current window and vertical splits to the
right of the current window. This is the behavior of tmux and the one
that I think makes the most sense for LTR language people like myself.