Revert b07b6e5..65e8cb1

This rolls back to commit b07b6e58bd4fc12f70b56fab4f6da9205178831d.
Added temperature sensor

For #290
Changed nSeg and added documentation.

For #290.
Added figure for documentation.

For #290
Revised slab models.

This is for #290.
Introduced enumeration for fluidHeatTransfer.
Moved documentation to UsersGuide.
Renamed example