Ignor auctex auto-folder and contents

When working with multifile LaTeX-documents in AUCTeX in emacs, it creates the auto-folder to keep track of styles, macros etc. in the whole document. Unnecessary of versioning purposes.
Splitted large comments into a few lines
Merge pull request #1046 from stenskjaer/patch-1

Ignore auctex auto-folder and contents
add Mercury language gitignore template
Merge pull request #1051 from bohdan4ik/patch-1

Splitted large comments into a few lines
removed Vim and ctags specific ignores; as these are handled in Global/
Merge pull request #1057 from sebgod/master

add Mercury language gitignore template