Conflicts with auctex

[tigerjack]

When the latex-extra-mode is automatically enabled through

(add-hook 'LaTeX-mode-hook #'latex-extra-mode)

the local file variables are not loaded (f.e. the TeX-master variable). So, I suspect the mode interferes somehow with the normal functioning of the LaTeX-mode.

On the other hand, if I disable the hook and then load the latex-extra-mode after, I get the error

helm-M-x-execute-command: Cannot open load file: No such file or directory, tex-buf

which should have been fixed in #36

[tigerjack]

I fixed the error here #38