hotfix-5549

Added functions to get the list of transactions and the number of transactions, chain.

assigned to @roman.khlopkov

added 5 commits

• acf1c686...c0576cc7 - 4 commits from branch master
• 333f8dc1 - [*] Merge master branch into hotfix-5549.

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added 1 commit

• c382a374 - [*] Fixed the problem that there was no memory cleanup.

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merged

mentioned in commit 614d99c5