Support for multiple savepoints
Simplify parameter validation and deprecation
Merge pull request #2000 from janmeier/multipleSavepoints

Support for multiple savepoints
Merge pull request #1994 from seegno/simplify-parameter-validator

Simplify parameter validation and deprecation
Check for an empty validation error message. Closes #2009
[ci skip] Small changes to API docs
Merge remote-tracking branch 'upstream/master'