Use `_' instead of `.' in typo3 extension zip.

Makefile

@@ -45,14 +45,14 @@ build-dist: t3sphinx make-dist-dir dist-copy-extension dist-move-doc git-revisio
 	echo "Distribution made in $(DIST)"
 
 nightly: bootstrap build-dist
-	cd $(DISTDIR); zip -r ../qfq-$(NIGHTLY_DATE)  $(EXTENSION_CONTENT) revision.git -x config.ini
+	cd $(DISTDIR); zip -r ../qfq_$(NIGHTLY_DATE)  $(EXTENSION_CONTENT) revision.git -x config.ini
 
 snapshot: bootstrap build-dist
-	cd $(DISTDIR) ; zip -r ../qfq-$(NIGHTLY_DATE)-$(GIT_REVISION_SHORT) $(EXTENSION_CONTENT) revision.git -x config.ini
+	cd $(DISTDIR) ; zip -r ../qfq_$(NIGHTLY_DATE)_$(GIT_REVISION_SHORT) $(EXTENSION_CONTENT) revision.git -x config.ini
 
 release: bootstrap build-dist
 	if [ -z "$(VERSION)" ] ; then  echo "Set VERSION make variable to the release version (fmt: maj.min.micro)" ; exit 1 ; fi
-	cd $(DISTDIR) ; zip -r "../qfq.$(VERSION)_$(RELEASE_DATE).zip" $(EXTENSION_CONTENT) revision.git -x config.ini
+	cd $(DISTDIR) ; zip -r "../qfq_$(VERSION)_$(RELEASE_DATE).zip" $(EXTENSION_CONTENT) revision.git -x config.ini
 
 t3sphinx: .virtual_env
 	. .python_virtualenv/bin/activate ; cd extension/Documentation/_make; make html