show hints on dataset matches in other DBS instances

* currently this is shown only for 1 keyword input of len>=3, e.g. andrey, zmm
* it automatically redirect to the dataset query only of keyword matche only in the current instance
  - e.g. RelValZMMGammadvmc --> dataset=*RelValZMMGammadvmc*
* otherwise, only a message/hint is shown [and only if parsing error occured], along with KWS results
* TOOD: make the hints clickable (only for next release...)

fixes issue #4102