delete commented out linked question code
Hide Contraint Message input under advanced properties if it doesn't have a value (Case:48477)
disallow multimedia on group questions (Case:48477)
Move repeat properties to logic properties and only show them for repeats (Case:48477)
remove calculate condition on all questions except data nodes (Case:48477)

also remove "is this question required?" for data nodes

possible further removals for groups and repeats pending discussion
Merge pull request #30 from dimagi/mwhite

various conditional display of inputs in vellum depending on question types (Case:48477)