GitLab

**Description**
 Make baseline check optional in data diagnosis and fix bugs.

**Major Revision**
- make baseline file optional in data diagnosis
- fix bugs of output in md and excel format when 'function' is not in the rule
- fix bug in multi_rules function that miss/failed test may failed the whole process

**Minor Revision**
- revise doc related with data diagnosis
- resolve warning message about baseline not found check, only raise exception if baseline not found in the  'variance' function
- move summary fields into top of json file
- unify 'Index','machine' -> 'index' in output file

**Description**
Update error handling to support exit code of sb result diagnosis.

**Major Revision**
- raise exception for any error to make exit_code=1

**Description**
Add result summary in excel,md,html format.

**Major Revision**
- Add ResultSummary class to support result summary in excel,md,html format.
- Abstract RuleBase class for common-used functions in DataDiagnosis and ResultSummary.

**Description**
Add md and html output format for DataDiagnosis.

**Major Revision**
- add md and html support in file_handler
- add interface in DataDiagnosis for md and HTML output

**Minor Revision**
- move excel and json output interface into DataDiagnosis