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Summary of the changes (Less than 80 chars)

SWEEP: Reviewed usage of atomic numeric type methods

Fixes #917

Description

This aligns usages of GetAndAdd(), AddAndGet(), IncrementAndGet(), GetAndIncrement(), DecrementAndGet(), and GetAndDecrement() match Lucene (for both AtomicInt32 and AtomicInt64). There were no significant issues found, but some of the adjacent code was corrected to use the correct types, casts, and formatting in the invariant culture.