[PDI-10209] MongoDB output step cannot insert an incoming field specified as "JSON" unless it is set as the value of a field in a top-level record; [PDI-10371] Leaving "Write concern (w option)" blank should default to write concern 1, but actually defaults to 0; [PDI-10153] MongoDB input step does not give any feedback when pressing get fields when port not set; [PDI-10373] MongoDB input step does not provide any feedback if Get Tags is pressed but no tags are defined on the server. Also snuck in a small logging level change for messages relating to batch commits.
Merge pull request #32 from m-a-hall/pdi4compatible

[PDI-10209] MongoDB output step cannot insert an incoming field specifie...