Moved configuration directory and file. CONFIGURATION NOTE.

OLD:

    ~/.score_manager
    ~/.score_manager/score_manager.cfg

NEW:

    ~/.abjad/ide
    ~/.abjad/ide/ide.cfg

NOTE: you must move the old directory and file for the IDE to recognize your
old configuration. Otherwise the IDE will create a new configuration directory
and file for you, minus the information of your old configuration.