Function: compoundForAccount(address _account)
Allows the handler to compound rewards for an account.
Inputs
_accountControl: Fully controlled by the handler.
Constraints: None.
Impact: Account to compound for.
Branches and code coverage (including function calls)
Intended branches
Should claim rewards and stake them back.
Assumes all other relevant checks are performed in each
claimForAccountandstakeForAccountfunction.
Negative behavior
Should not be callable by anyone other than the handler.