vimrc: Some more maps, and a new function to list environment variables.
mabcolours: Make the status line better.
rerun_last_ex_command_and_put: Just some added comments.

The new status line is better because the active window stands out more.
Until now I've been occasionally reading the wrong status line.

The new function to list environment variables was also written to work with
rerun_last_ex_command_and_put.  That was tricky.
Merge branch 'master' of git@github.com:rnikey/vimfiles.git