Refs #9475 Fixed some copy-paste errors

There was an error in an output message, and an error in retrieving Y-values from the wrong workspace. Both seemed to be copy-paste errors, both easily fixed as all it ammounted to was 3 characters being changed.
Refs #9475 stiching tests

added 4 of the stitching tests: test_stitching_forces_start_overlap, test_stitching_forces_end_overlap, test_stitching_scale_right and test_stitching_scale_left
Refs #9475 Manual Scale Factor and related tests

Manual scale factor override is now implemented

Tests have been ported