tab-substitution of LaTeX symbols in Emacs julia-mode (for #6340, based on #6911)
NEWS for emacs symbol substitution
more sensible sorting of substitutions; only search backwards as in REPL, and allow a wider range of chars (for things like #6927)
Merge pull request #6920 from stevengj/emacstex

RFC: tab-substitution of LaTeX symbols in Emacs julia-mode