added more test data for impossible parents

pyrat-data-forbidden-parents.csv

@@ -0,0 +1,7 @@
+ID,Line / Strain (Name),DOB,Father 1,Mother 1,Father 2,Mother 2,Sacrifice reason,Mutation 1,Grade 1,Father 1: Mutation 1,Father 1: Grade 1,Father 2: Mutation 1,Father 2: Grade 1,Mother 1: Mutation 1,Mother 1: Grade 1,Mother 2: Mutation 1,Mother 2: Grade 1
+ID-001,Line-A,15/12/2025,,,,,End of experiment,Mut-A,hom,,,,,,,,
+ID-002,Line-A,15/12/2025,ID-F1,,,,End of experiment,Mut-A,het,Mut-A,het,,,,,,
+ID-003,Line-A,02/01/2026,,,ID-M4,,End of experiment,Mut-A,het,,,Mut-A,het,,,,
+ID-004,Line-A,02/01/2026,,ID-M3,,ID-M4,End of experiment,Mut-A,het,,,,,Mut-A,het,Mut-A,het
+ID-005,Line-A,15/02/2026,ID-F5,,ID-F6,,End of experiment,Mut-A,hom,Mut-A,hom,Mut-A,hom,,,,
+ID-006,Line-A,15/12/2025,ID-F1,ID-M1,ID-F2,ID-M2,End of experiment,Mut-A,hom,Mut-A,hom,Mut-A,hom,Mut-A,het,Mut-A,het

standardised-data-forbidden-parents.csv

@@ -0,0 +1,2 @@
+ID,Line / Strain (Name),DOB,Father 1,Mother 1,Father 2,Mother 2,Sacrifice reason,Mutation 1,Grade 1,Father 1: Mutation 1,Father 1: Grade 1,Father 2: Mutation 1,Father 2: Grade 1,Mother 1: Mutation 1,Mother 1: Grade 1,Mother 2: Mutation 1,Mother 2: Grade 1
+ID-006,Line-A,15/12/2025,ID-F1,ID-M1,ID-F2,ID-M2,End of experiment,Mut-A,hom,Mut-A,hom,Mut-A,hom,Mut-A,het,Mut-A,het