#5872 convert-ly rule for 2.19.39 as cleanup for issue 4800

[David Kastrup]

convert-ly rule for 2.19.39 as cleanup for issue 4800

That issue made previously valid and promoted code invalid without
proper replacement.

Property assignments of the form

staffgroup-staff-spacing #'basic-distance = #15

are converted to

staffgroup-staff-spacing.basic-distance = #15

for various paper or layout spacing variables.

http://codereview.appspot.com/565850043

[Anonymous]

Passes make, make check and a full make doc.

[Anonymous]

Patch on countdown for April 4th

[Anonymous]

Patch counted down - please push.

[Anonymous]

Issue 5872: convert-ly rule for 2.19.39 as cleanup for issue 4800
author  David Kastrup <dak@gnu.org> 
    Sun, 29 Mar 2020 23:49:14 +0100 (00:49 +0200)
committer   David Kastrup <dak@gnu.org> 
    Sun, 5 Apr 2020 10:10:16 +0100 (11:10 +0200)
commit  10df1245877fb5e16410388ef42b71c9aa06a9d9