Resolve "faster data integrity test / faster directory test"

Merged Ramon Nou requested to merge rnou/186-reduce-size-of-trunc-test-file into master

Closes #186 (closed)

Data integration is reduced to a few cases using write_validate Directory test is reduced using C++ code that writes a file and returns the number of elements in the directory directly.

The time is reduced from 10 min to 3 minutes in the data integrity, and from 6 minutes to 5 minutes

Edited by Ramon Nou

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