gitconfig: Always use Unix line endings.
vimrc: convert to UNIX line endings automatically.
cat.run has been here for enough long.
Multiple changes:

* Change copyright timestamps
* LICENCE.md: cut `git shortlog` to two lines and add `ne`.
* README.md: increase topic levels.
* oidentd.conf: remove Windows line-ending(?) (so that is what it was).
* xsessionrc: update PATH.
update xsessionrc:

* fix nesting.
* remove OS X automatic commands that are functions in bashrc & zshrc.