MIFOSX-1161: Adding new properties

Adding fields minRequiredBalance and allowOverdraftMinBalance to
SavingsProduct and SavingsAccount. No enforcement yet.
MIFOSX-1161: Enforce minRequiredBalance
updating documentation for MIFOSX-1324
Merge pull request #981 from pramodn02/develop

MIFOSX-1275 : added table to maintain execution history of standing inst...
Merge pull request #982 from vishwasbabu/develop

updating documentation for MIFOSX-1324
Merging @rainerhessmer  changes around MIFOSX-1161
fix test failures
MIFOSX-1392 : changes for minBalanceForInterestCalculation