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Attempt to speed up the geometry checksum

Ben Couturier requested to merge fast_checksum into master

Attempt to speed up the geometry checksum: as we now have ~18e6 nodes placed in the geometry, the previous code became very slow (~minutes). It is not efficient as it first prepares a string representation of a node (~60% of the time is spent in that). This branch uses CRC32 instead and checksums the values without an intermediary string representation.

Edited by Ben Couturier

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