Vertical spacing: Was between-system-space deprecated?

[ivan . k . kuznetsov]

I am interested in controlling the vertical spacing
within systems.

I recently migrated from 2.12.2 to 2.15.39 .


In my one lilypond score, the spacing between
systems changed greatly between the PDFs built with
these two versions


Online documentation v2.12, has a section that specifically
discusses this:

  4.4.2 Vertical spacing between systems

and discusses the use of the following four variables:

  between-system-space = 1.5\cm
  between-system-padding = #1
  ragged-bottom=##f
  ragged-last-bottom=##f


I started looking at the 2.14 documentation (the most
recent I could find at http://lilypond.org) and the title
of 4.4.2 was changed to:

   4.4.2 Explicit staff and system positioning

(which generally means the same thing) though now this
section includes no mention of the 
between-system-space and between-system-padding
variables.


Are these four variables considered deprecated?

Thanks;