Allows to merge the contents of two fields: one from source database, the other from target database.
This function will only operate on those species listed in the hitlist of the source database.
The field contents will be tagged (with the specified Source- and Targettag). If you use e.g. 'DB1' and 'DB2' as tags the merged result will look like:
Result [DB1] source-content [DB2] target-content
If both fields have the same content, it will be merges like:
Result [DB1,DB2] content
The result will be written into the selected target database field.
You may also specify a tag (mask) to be deleted.