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