loongson/pypi: links for visaplan-plone-pdfexport

loongson/mirror visaplan.plone.pdfexport-1.0.tar.gz
loongson/mirror visaplan.plone.pdfexport-1.0.dev3.tar.gz
loongson/mirror visaplan.plone.pdfexport-1.0.dev2.tar.gz
loongson/mirror visaplan.plone.pdfexport-1.0.dev1.tar.gz