dev-python/pychart: convert to distutils-r1, and EAPI=5

Signed-off-by: Lan Yixun (dlan) <dennis.yxun@gmail.com>
dev-python/pywebdav: convert to distutils-r1, and EAPI=5

Signed-off-by: Lan Yixun (dlan) <dennis.yxun@gmail.com>
app-office/openerp: convert to distutils-r1, EAPI=5

Signed-off-by: Lan Yixun (dlan) <dennis.yxun@gmail.com>