If a client provides a read buffer of insufficient size for all
available data, we have two options
1) Leave it to the client to do partial reads until not further data is
available, or
2) Signal the client that there still some bytes on a partial read.
As the second option seems more robust it's implemented in this commit.
Fixes#1705
This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.
Issue #1082
