[patch] ox-beamer: allow setting frame subtitle with BEAMER_SUBTITLE property

[hugo]

Hi all,

I found recently I wanted to add subtitles to some slides in beamer in
an export from org-mode. In the end I had to write an
explicit #+beamer: declaration with latex code in it for each
headline. The attached patch implements an easier (I think) way of
setting subtitles, with properties on org headings which are exported
as frames. I hope this is helpful.

Best,

Hugo

0001-ox-beamer-allow-setting-frame-subtitle-with-headline.patch
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