Non-standard octave-limited key signature does not persist

[Trevor Daniels]

If a non-standard key signature is defined using the format which limits the
alterations to a single octave, the alterations defined in the key signature
persist only up to the end of the first bar which contains a pitch to be 
altered.
They should persist indefinitely.

In this example the F# and Ab are notated correctly only in bar 1.  A Bb 
does not
appear until bar 3, when it is notated correctly, but is incorrect in bar 4.

\relative c' {
 \set Staff.keySignature = #`(((0 . 3) . ,SHARP)
                              ((0 . 5) . ,FLAT)
                              ((0 . 6) . ,FLAT))
 fis fis aes aes
 fis fis aes aes
 fis aes bes bes
 fis aes bes bes
}

If the alternative (not limited to a single octave) form is used the key 
alterations
do correctly persist indefinitely:

\relative c' {
 \set Staff.keySignature = #`((3 . ,SHARP)
                              (5 . ,FLAT)
                              (6 . ,FLAT))
 fis fis aes aes
 fis fis aes aes
 fis aes bes bes
 fis aes bes bes
}


Trevor