Small bug fix for double shared mooring line

- previously unable to have 2 shared lines going between the same turbines, because shared line IDs were platformIDA-platformIDB
- now checks if line ID exists already before making a new shared line, adds letter at the end based on number of moorings conencted to platformB so it is always unique ragardless of # of common shared lines.

Author: lsirkis

fad/project.py

@@ -619,8 +619,12 @@ def loadDesign(self, d, raft=True):
                     mdd = getMoorings(lineconfig, lineConfigs, connectorTypes, 
                                       PF[0].id, self, lineProps=self.lineProps)
 
+                    if not str(PF[1].id)+'-'+str(PF[0].id) in self.mooringList.keys():
+                        sid = str(PF[1].id)+'-'+str(PF[0].id)
+                    else:
+                        sid = str(PF[1].id)+'-'+str(PF[0].id)+alph[len(PF[1].getMoorings())]
                     # create mooring class instance
-                    moor = self.addMooring(id=str(PF[1].id)+'-'+str(PF[0].id), 
+                    moor = self.addMooring(id=sid, 
                                            dd=mdd,
                                            shared=1)