Improve bash_profile comments.
Don't use ii as esc in vim any more.
Remove MacPorts config from bash_profile.

Use HomeBrew instead.
Configure terminal prompt appearance.

Change terminal prompt to "Username$ currentDirName ". (Excluding
quotes, replacing Username with your user name & currentDirName with the
name of the current directory, or ~ to represent HOME$.
Add ideavim block indent bug workaround.

See http://youtrack.jetbrains.com/issue/VIM-705 for a description of the
ideavim block indent bug as well as the suggested workaround.