Figured Bass commands in property-init.ly

[Carl D. Sorensen]

There are twe elements of figured bass notation that are an integral part of 
the notation, so Graham said we should make predefined commands for them.  Doea 
anybody object to

figuredBassExtendersOn = {
  \set useBassFigureExtenders = ##t
}
figuredBassExtendersOff = {
  \set useBassFigureExtenders = ##f
}

or

figuredBassBelowStaffOn = {
  \override Staff.BassFigureAlignmentPositioning
     #'direction = #DOWN
}
figuredBassBelowStaffOff = {
  \override Staff.BassFigureAlignmentPositioning
    #'direction = #UP
}

Carl Sorensen