Pedigree editor form improvements

Modify the wording on the pedigree editor menu form so it is more user friendly.
If node is not linked to a patient record:

• change "Patient record" to "Link to an existing patient record"

• add "i" if possible stating "Search by typing either patient name or identifier."

• align "Create new" button to the PatentID field

If pedigree node is linked to a patient record:

• change "Patient record" to "Linked to patient record"

• change the label on the button from "Unlink patient record" to "Unlink"

Two lines with bolded fonts are the most important.