doc: Remove 'textmode'

by @mhinz
runtime: Remove 'textauto'
doc: Remove "h" flag of 'highlight' option

HLF_H is an obsolete flag and got replaced by HLF_E.

From: Marco Hinz <mh.codebro@gmail.com>
Change vimdir path from vim to neovim
Add install target for runtime dir
Merge pull request #1005 '[RFC] Change vimdir path from vim to nvim'
vim-patch:7.4.309 #843

Problem:    When increasing the size of the lower window, the upper
            window jumps back to the top. (Ron Aaron)
Solution:   Change setting the topline. (Nobuhiro Takasaki)

https://code.google.com/p/vim/source/detail?r=88a6e9f33822d33b6c32db578750c6c178c63f50
Update luarocks. #1018

Fix #1013.
Partial C99 cleanup of term.c #1020
documentation: update documentation for :mode

see #588