Allow <Plug> mappings to be available even when FerretMap=0
Allow <Plug> mappings to be available even when FerretMap=0

Maybe the <Plug> options could be kept when g:FerretMap=0, as they are
still useful in case the user wants simply to map some keys to the
mappings they want... and it probably won't conflict with another plugin
(all <Plug> commands here are prefixed in the format
<Plug>FerretFooBar).

For example, my <leader>r mapping is already bound to another plugin,
and I don't want to have the <Plug>FerretLack command bound to <leader>l
as I don't use it (and another plugin could want to use it). In this
case, I simply want to setup some mappings by myself, but mapping
<Plug>FerretAcks is a lot easier than mapping its entire definition.

wincent/ferret