08-09-19 Introduced adding heat Source

The Heat Source option has been further developed to include up to two independent heat sources. See Switch HeatSource in the Soil Heat Flow module. The first heat source is considered to have a chemical original and the second is controlled by biological processes. Both heat sources have also got a time dependence as controlled by an exponential decay controlled by the new parameters Source1 Decay Coef and Source2 Decay Coef. The teat source options have been suggested by Bo Elberling and Jorgen Hollesen from Copenhagen University.