proposed predefined for ChordNames context

[Carl D. Sorensen]

I would like to propose the following predefined commands for the ChordNames 
context:

hideRepeatedChordNames = {
  \set chordChanges = ##t
}
showRepeatedChordNames = {
  \set chordChanges = ##f
}

Here is an example of their use.

hideRepeatedChordNames = { \set chordChanges = ##t }
showRepeatedChordNames = { \set chordChanges = ##f }
harmonies = \chordmode {
  c1:m c:m \break c:m c:m d
}
<<
  \new ChordNames {
    \hideRepeatedChordNames
    %set chordChanges = ##t
    \harmonies
  }
  \new Staff {
    \relative c' { \harmonies }
  }
>>
<<
  \new ChordNames {
   \showRepeatedChordNames
   %set chordChanges = ##t
   \harmonies
  }
  \new Staff {
    \relative c' { \harmonies }
  }
>>

Please give me your comments.

Thanks,

Carl