The ornamental design for a habitation, as shown and described.
FIG. 1 is an oblique view, taken from the front and from above, of a habitation showing the new design;
FIG. 2 is another oblique view thereof, taken from the rear;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The dashed line showing of structural lines is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.