alpha testing last-bottom-spacing

[Keith E OHara]

Dear bug readers,
(possibly Mark in particular because he documented this new feature)

The stretchability of last-bottom-spacing seems to be ineffective in 2.13.37.
If we adjust the 'space' item in the alist, it increases the space on the 
bottom of the first page of a score,
but this gap seems unstretchable regardless of the stretchability setting.

The attached example is admittedly not tiny, but the \paper block is tiny:

\paper {
    % To reduce excessive stretching of systems,
    % especially with one system per page
    % increase stretchability (was 5 staff-spaces) Others are -.37 defaults
    last-bottom-spacing = #'((space . 1) (padding . 1) (minimum-distance . 0) 
(stretchability . 25))
}
%{Be aware of issue 1338 :  we must set properties as complete groups, even the
    elements we are not changing, or else the behavior will change if anyone 
uses
    this file with annotate-spacing=##t
%}

The best news you could give me, is that I've done something stupid.
-Keith

bottomSpacing.ly
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