Console uses Solarized (Dark) colorscheme, so having a light
background doesn't work well in the console. On the other hand,
the dark background is hard to read in MacVim (for me).
The { mapping used to open a C-style block, however, it gave several
problems when dealing with Perl code and hashes. This converts it to
simply working as {}, like the ( -> () and [ -> [] mappings.
This will always highlight characters that exceed the 80 character
limit with ErrorMsg, but will also highlight the 81st column, so
the user knows when to break.
Also delete the forcing of &t_Co to 16 since under tmux, it
automatically detects the 256 colour mode for solarized and is therefore
no longer necessary.