Updated docs/scripts, vim and vimperator

  * vimperator/vimperatorrc: minor update, added empty lines;
  * vim: some changes in settings
    - gist-user.vim: removed with corresponding settings (reason: don't
      used);
    - shortcuts.vim: added empty lines;
    - common.vim: removed settings for gist-user.vim and added option
      for NERDCommenter (add space after and before comment mark);
    - gvimrc, vimrc: updated doc string in comments;
  * docs/scripts/tex-stuff.org: 'texlive-trunk-rsync': changes default
    location for 'trunk';
  * (TOP)/bin: context-suite-update, texgrep, texlive-trunk-rsync,
    texlive-updated, texls, texview: regenerated, tangled from Org
    document;
  * rc/texlive-rsync-servers: regenerated, tangled from Org document.