init.el: config tweaks, see below.

  * disable show-trailing-whitespace in diff mode
  * renamed ajt-blame to ajt-git-blame
  * added ajt-git-diff
  * added ajt-make-server-no-typecheck function (used for NgCore development)
  * messed with fonts.
  * messed with PATH.
  * Some projects I work on require tab indent, some require space indent, added
    a find-file-hook to automate this for me.
  * jabber functions to help automate logging into NgCore chat.