extend the version-distance in wheel file naming

Borreguero Calvo, Joserequested to merge
extenddistance into next

Description

Extend the version-distance with an abbreviated form of last commit's SHA.

For example, from 2.1.0.dev4 to 2.1.0.dev4+4c1a7c5 because tags 2.1.0-rcX all yield the same root 2.1.0 so four commits ahead of tag 2.1.0-rc1 and four commits ahead of 2.1.0-rc2 will yield the same version distance 2.1.0.dev4. We need also to append the an abbreviated form of last commit's SHA.

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