Initial implementation of SMPP multipart messages using SAR parameters.
Initial implementation of SMPP multipart messages using painstakingly handcrafted user data headers.
Merge branch 'develop' into feature/issue-623-smpp-sar-concatenated-messages
Handle multiple sequence numbers when sending multipart messages over SMPP.
Refactor submit_sm to avoid silly unnecessary recursion.
Add some explanatory comments and avoid splitting a messages if it is already small enough.
Test lengths of SAR/UDH multipart messages.
Object to more than one multipart message mechanism in SMPP config.
Extra commentary and a constant for the SMPP multipart message numbers.
Merge branch 'feature/issue-623-smpp-sar-concatenated-messages' into develop