This is a major patch, because header files are renamed, and
the header directory with them. Still, no functional change is there.

Corrected the computation itself (do not move pointers, but the .start field!).
Define posix_timer_adjust_all and its alias pp_timer_adjust_all

Actually, the best way for implementing timers is to use MONOTONIC_RAW which
avoids the need of such an adjust function

PP_DEFAULT_NO_ADJUST must be set to 0, otherwise the slave would not adjust
the time. It can be set to 1 with -t parameter in cmd line: this can be useful
for debug purpose, but must not be the default.

The correct one is in rt_opts struct. Removed the oldest one, which was still
used (but not set to its default) and lead to a division by zero

This fixes a misunderstanding by my side on ptpd's code. Timers are
not single-shots, but must be fired once every 'interval', where
interval is defined in timer_start. If one wants to stop it, a
timer_stop can be called
Signed-off-by: Aurelio Colosimo <aurelio@aureliocolosimo.it>

gPTP uses the peer multicast address for all packets
Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com>

pass correct payload to state machine
check minimum packet size when receiving it

Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com>

Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com>