Finally got rid of tabbar and slime header line.

Last improvements are:

• got rid of TABBAR and SLIME header line in REPL buffer, so I have less trash on the screen.
• changed buffer switching to bs-show, which is more compact and sane
• turned on IDO-mode, which is good for loading files
• turned on autocomplete-mode everywhere
• turned on highlight-symbol-mode everywhere

Here is the .emacs file:

Maybe later I would split it to different files and do something like Steve Yegge did.