Add a new `make install-all` command that will perform all `make
install` actions along with generating the manpages. The `manpages`
command is then removed from the existing `make install` command. The
docker build is then updated to use the new `make install-all` command.
This is done because some users running `make install` may be doing so
in environments where they do not have write access to the directory
where the man pages need to be written to.
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