protected (some) complex variants from left-trimming in normalize #75
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This patch prevents the trimming of complex variants that are already normalized.
Example: trimming
CAT -> CG
changes it to a form that is hard to analyze: AT -> G. Indeed, some tools, such as freebayes, interpret it incorrectly, while the original combination of a deletion and a SNP presents no problems.I do not know whether the solution I present here is complete (I suspect not), but it fixes all instances of this type of error I was able to find in my data.