Drop tarball releases and go ELPA only

Hi all, you may have seen that there was some work in creating a new branch 'main' which can be used easily to make an ELPA release by anyone who has write access to AUCTeX repo. We have now 6 releases this way under our belt and it works quite smooth. The logical consequence from this effort

Re: activating LaTeX-mode automatically

Paul Nelson writes: > Indeed, your suggestion (or deleting ":mode" from mine) fixes things. > I get now that *.tex maps to tex-mode which remaps to TeX-tex-mode, > etc. Thanks for your feedback. Good to know that AUCTeX is meanwhile a better use-package citizen ;-) I guess we have to update