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Translate alternative start to M, also in variant

Vermaat requested to merge alt-start-m into master

In case of an alternative start codon, the variant CDS was not translated to a protein starting with M. This caused the protein description machinery to conclude a variant affecting the start codon, hence reporting p.?.

We fix this by always translating the start codon to M (except when the variant actually affects it).

Example: NM_024426.4:c.1107A>G (a synomymous mutation) should yield NM_024426.4(WT1_i001):p.(=), not p.?. The start codon for that protein is CTG.

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