hiercluster: issues with clustering numeric terms

[xzhou82]

not urgent. can wait for allpharm paper

• there lacks (or has always been lacking) a way to group edit the clustering terms
• clicking the clustering group label and Add Rows it fails to restrict and can add categorical term to break R which is bad Restrict drug terms #3757
• at allpharm LC50 , at group label > Add Rows > select Cytarabine, breaks with There are no overlapping tested samples and plot stays cloaked over and unusable fix numericDictTermCluster #3700