This moves from a one-size-fits-all approach for tab expansion to
dictating a default expansion scheme and a per filetype scheme. The
current plugin has custom schemes for Ruby and Makefiles.
Instead of using <ESC>i to get out of insert mode and reenter it at
the closing bracket, Vim accepts the use of <Left> to move the cursor
left without leaving insert mode. This allows undo and repeats to work.
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.