my-util.el: MRU compilation buffer stuff

Just realized I've been calling it LRU this whole time.

  __       _ _ _
 / _| __ _(_) | |
| |_ / _` | | | |
|  _| (_| | | |_|
|_|  \__,_|_|_(_)
erc-setup.el: function to hide erc notification messages in erc buffers
init.el: increase fill-column