(tmux/Zsh alias)Force tmux run in 256 colors on startup.
Merge branch 'trial-tmux-force-256-colors-on-startup' into trial
Revert "Merge branch 'trial-tmux-256colors' into trial"

It didn't work...
This reverts commit 55d4072123ffe50fbae348a61be8db5af7fca6e3, reversing
changes made to 6655ac67324fbe9cc7ed4d3303769a2ae506845a.