Size of titles when staff size and lyrics size are set independently in LilyPond version 2.18.2.

[Mirosław Doroszewski]

Size of titles when staff size and lyrics size are set independently
in LilyPond version 2.18.2.

1. When staff size and lyrics size are set independently, happens that
size of titles is too small.
2. My solution is not universal: it has to be dane on every titles of
large document (book).
3. And if number of pieces are big, i.e. 500, like in a song book?
4. I tried set font size of titles by overriding them in
bookTitleMarkup (taken from titling-init.ly) put in piece template
(with print-all-headers = ##t), but without any effect:

bookTitleMarkup = \markup {
  \column {
    \fill-line {
      \abs-fontsize #20 % do not work
      \fromproperty #'header:title
    }
  }
}