start billing section in invoices, introduce sessions for securing transmissions

[invoices] / cgilite

diff --git a/cgilite b/cgilite
index 5c24129a2347b2be54fedfec74acc156758e3533..3fe2a9ceb477adf245f6cc8f72fb61282e42c904 160000 (submodule)
--- a/cgilite
+++ b/cgilite
@@ -1 +1 @@
-Subproject commit 5c24129a2347b2be54fedfec74acc156758e3533
+Subproject commit 3fe2a9ceb477adf245f6cc8f72fb61282e42c904