Changed input signal from u to TSet.

For #39.
This is to distinguish it from HeaterCooler_u.
This commit also cleans up issues with line endings.
Added fixme and converted file format.

This is for #39.
The file format was changed because Dymola keeps changing the line
endings.
Revised example to test flow reversal.

For #39.
Revised example to test flow reversal.

For #39.