error in getBlob and findAllIovs methods fixed

Mikhail Mineevrequested to merge
mmineev/athena:22.0-mvg-02 into master
  1. Errors in the methods getBlob and findAllIovs fixed.
  2. A prototype of a method with multiple optional parameters added.
  3. Added a real test for CrestApi package.
  4. New exaples in the doc directory added.

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