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let scaffolder use ambiguous alignments when no unambiguous ones exist (#904)

When scaffolding contigs to a reference, if no unambiguous alignments cover a part of reference, let the scaffolder consider ambiguous ones, when all alignments mostly agree on the sequence.  The ambiguity can be the result of a misassembly, where the same reference part appears twice in a contig.   Also, in case of a repeat, dropping all ambiguous alignments could leave a hole in the assembly.

2609 of 4297 branches covered (60.72%)

7385 of 9886 relevant lines covered (74.7%)

0.75 hits per line