Fix up other places in makefile to use PYTHON variable

Only the nosetests aren't using the PYTHON variable now.

Makefile

@@ -172,16 +172,16 @@ deb: debian
 # for arch or gentoo, read instructions in the appropriate 'packaging' subdirectory directory
 
 modulepages:
-	PYTHONPATH=./lib hacking/module_formatter.py -A $(VERSION) -t man -o docs/man/man3/ --module-dir=library --template-dir=hacking/templates
+	PYTHONPATH=./lib $(PYTHON) hacking/module_formatter.py -A $(VERSION) -t man -o docs/man/man3/ --module-dir=library --template-dir=hacking/templates
 
 modulejson:
 	mkdir -p docs/json
-	PYTHONPATH=./lib hacking/module_formatter.py -A $(VERSION) -t json -o docs/json --module-dir=library --template-dir=hacking/templates
+	PYTHONPATH=./lib $(PYTHON) hacking/module_formatter.py -A $(VERSION) -t json -o docs/json --module-dir=library --template-dir=hacking/templates
 
 modulejs:
 	mkdir -p docs/js
 	make modulejson
-	PYTHONPATH=./lib hacking/module_formatter.py -A $(VERSION) -t js -o docs/js --module-dir=docs/json --template-dir=hacking/templates
+	PYTHONPATH=./lib $(PYTHON) hacking/module_formatter.py -A $(VERSION) -t js -o docs/js --module-dir=docs/json --template-dir=hacking/templates
 
 # because this requires Sphinx it is not run as part of every build, those building the RPM and so on can ignore this