Implement source lines for input hydrographs

[PaulaSp3]

check "sourceLines" in SamosAT the implementation: https://git.avaframe.org/AvaFrame/AvaFrame_SamosDFA/src/branch/master

(e.g., in folder src or in https://git.avaframe.org/AvaFrame/AvaFrame_SamosDFA/src/branch/master/files/AK_Attributes -> inititialisation )

[fso42]

duplicate of https://github.com/OpenNHM/AvaFrame/issues/1272 , which one do you want to keep?