Creation of : 
- RectilinearGrid to visualize computed quantities with paraview 
- NumericalSolver to integrate tranfers on the whole grid
- FlowPatternMap to visualize the flow pattern map and to compute it

Changes on :
- AircooledCondenseur : to keep mostly geometrical properties
- TransferUnit : now called HeatTransferLocalUnit, deals only with heat
		transfers and performs no integration tasks
Second commit
Work is going on
debugging in progress
The code is running. Work is almost finished.
Still the output to paraview to code