Fix local deploy for dotfiles with implied targets

When a dotfile is listed in the mapping with no target path, it is
implied that the target path is identical to the source path.  This
feature was mentioned in the readme but never implemented.
Implement dotfile mapping includes

When a dotfile mapping includes an #include directive, it will load the
requested mapping file as well, and this can be done recursively to any
extent requested.  This is done to allow, for instance, nested dotfile
repositories to each have their own dotfile mappings, and the containing
repo's mapping can then chain to the nested mappings.
Rename Dotlink -> dotlink
Feature bump