Elpafy auctex based on 13.2-1
- This is an attempt to make auctex ELPA compatible so that use-package users don't have to have 2 copies of auctex when one of them is installed through APT (more details in bug#1056939[1]).
- Note that currently there is a limitation of dh-elpa that doesn't support byte compiling for sub-directory in ELPA install directory, which will be supported in a future version of dh-elpa. (I'll be experimenting another implementation based on that separately.)
- For this MR, only the *.el files in root install directory is installed in ELPA directory because of the limitation explained in the previous bullet, which is sufficient for registering its installation with ELPA/package.el.