Use source dir for data docs

docs/data/Makefile

@@ -10,9 +10,9 @@ BUILDDIR      = build
 # Internal variables.
 PAPEROPT_a4     = -D latex_paper_size=a4
 PAPEROPT_letter = -D latex_paper_size=letter
-ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees -c . $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
 # the i18n builder cannot share the environment and doctrees with the others
-I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
 

docs/data/conf.py

@@ -9,6 +9,7 @@ from docs.shared.conf import *
 # Add any paths that contain templates here, relative to this directory.
 templates_path.append('source/_templates')
 
+sys.path.insert(0, os.path.abspath('.'))
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,