Fix rst2pdf/Sphinx problem a better way

Our Sphinx config specifies the use of rst2pdf:
extensions = [ ... 'rst2pdf.pdfbuilder', ...
As of 0.99 we apparently need to declare a pdf stylesheet, even though
we don't knowingly use that style.

With that change, unpin rst2pdf again. Also upgrade lxml, leaving
it pinned to a version with a comment why.

Signed-off-by: Mats Wichmann <mats@linux.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/sphinx/conf.py b/doc/sphinx/conf.py
index d6d0778..9db9095 100644
--- a/doc/sphinx/conf.py
+++ b/doc/sphinx/conf.py
@@ -59,6 +59,10 @@ napoleon_include_private_with_doc = True
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 
+# Since 0.99, rst2pdf says: "twoColumn isn't part of the default styles
+# in 0.99. You need to add the twocolumn style file."
+pdf_stylesheets = ['twocolumn']
+
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 #