switch vim flavour to Neovim; reason: macOS clipboard support

access to system clipboard was broken in command-line vim, the buffers
"+ or "* were said not to exist and neither unnamed or unnamedplus
clipboard settings were working.

Aliases nvim to "vim"

home/vimrc

@@ -36,11 +36,8 @@ set incsearch
 set autoindent
 set history=1000
 " set cursorline
-if has("unnamedplus")
-  set clipboard=unnamedplus
-elseif has("clipboard")
-  set clipboard=unnamed
-endif
+" use system clipboard as default buffer
+set clipboard=unnamed
 
 " set expandtab
 set shiftwidth=4
@@ -101,7 +98,7 @@ au FileType nix setlocal tabstop=2 expandtab shiftwidth=2 softtabstop=2
 set ofu=syntaxcomplete#Complete
 " nmap <C-V> "+gP
 " imap <C-V> <ESC><C-V>a
-vmap <C-C> "+y 
+"vmap <C-C> "+y 
 
 " ALE linter settings
 let g:ale_linters = { 'python': ['flake8'] }
@@ -109,4 +106,4 @@ let g:ale_linters = { 'python': ['flake8'] }
 " vim-pandoc settings
 let g:pandoc#modules#disabled = ["spell"]
 set textwidth=0
-set wrapmargin=0
+set wrapmargin=0