beginning of a configuration system, supporting user-global, directory-specific, and language-specific settings
document no longer maintains an array of Line instances; just stores strings and creates Line on demand
editor line is now displayline, solely used for rendering text into a window
the settings object lived at the wrong level; reworked
wired the new config object up to the controller interface
Merge branch 'master' of https://github.com/marssaxman/lindi