vimrc -Extended set of key sequences within tmux.

When vim is run within tmux, tmux sends xterm style key sequences (with
the option enabled) and keys such as Ctrl-arrow keys give a totally
different behavior. This fixes all those keys.
tmux - Correct keybindings for copy/paste buffers.

Correct the key bindings so that tmux does not hang (with xclip). Using
xsel instead seems to work without issues.
Fixed typo.
Turn on titles in tmux.
tmux: Unbing Space and Enter keys in copy mode.
tmux - Use Home/End keys in copy mode.

Add key bindings for Home/End keys to move to start/end of line in copy
mode.