GitLab

This is a general fix addressing several issues in the retrieval of
histogram data from latmon, which reverts #6b2425d8

 in the same move:

- use a safe socket send loop in order to cope with partial writes on
  the latmon side.

- drop the very notion of warmup time, the system must be ready to
  respond with no delay or preparation, and the average figures won't
  be affected over long enough runs anyway.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>