dal.py: Table class: validate_and_update_or_insert method created, and minor changes in validate_and_update
dal.py: Table class: validate_and_update_or_insert method created, and minor changes in validate_and_update
dal.py: Table class: validate_and_update_or_insert method created, and minor changes in validate_and_update
dal.py: Table class: validate_and_update_or_insert method created
Merge pull request #388 from gitanoqevaporelmundoentero/master

dal.py: Table class: validate_and_update_or_insert method created, validate_and_update minor changes