Replaces :e in `vimwiki#base#follow_link()` with :drop, making this the
default behavior for pressing <CR> on a link. Checks for the existence
of :drop first, since this isn't available in some builds.
Adds a new :VimwikiTabDropLink and makes this a default for the keybindings
formerly occupied by :VimwikiTabnewLink; leaving :VimwikiTabnewLink
available for backwards compatibility and anyone who still wants the old
behavior.
Doesn't touch the split window reuse functionality, or the
:VimwikiGoBackLink behavior, although I can see an argument for adding
:drop to the latter.
I've wanted this for a while and happened to notice @davidlmontgomery's
patch from 2016 in #238. Code has moved around a little since, but I
think this is correct.
Brennen Bearnes
8e4202847f