Thanks to elados93 for the patch.

The C11 specification allows only sig_atomic_t and _Atomic variable
access. All other accesses to global variables are undefined behavior.

Using int was probably OK on x86 and x86_64; yet there were some reports
from other architectures (especially some MIPS) that in rare cases,
after issuing SIGHUP, BIRD did strange things.

The bfd_reconfigure_neighbors() returned after first reconfigured
neighbor instead of continuing with the next one.

Thanks to Winston Chen for the bugreport and a patch.

Exported route may be in modified state, we need to get cached one for
rte_same() and rta_clone() to work properly.

Multi-worded commands are not automatically added to top-level
help output.

Thanks to Christoph for the bugreport.

Function bodies were compared in post-parse time, yet the result was not
used and the functions were incorrectly considered the same as before.

Now the result is used to reload affected protocols.

Based on a patch from Liam Nattrass, thanks.

The old 'where' code computed size value incorrectly, which leads
to invalid instruction lines and filter errors or crashes.

The attribute should not be modifiable by filters as we do not
support its type.

There is an improper check for valid message size, which may lead to
stack overflow and buffer leaks to log when a large message is received.

Thanks to Daniel McCarney for bugreport and analysis.

It crashed when used without protocol argument.

Thanks to Alexander for the bugreport.

We forgot to do that. Oops.

Instead of having large stack buffer for max amount of AFI/SAFI pairs.
The old code is not correct w.r.t. extendeded option length, as more
AFI/SAFI pairs may fit into the capability option.

Extends BGP options/capabilities data length to 16bit, to avoid issues
with too many capabilities. See draft-ietf-idr-ext-opt-param-07

Only channels that are up can be reloaded.

The patch implements optional internal export table to a channel and
hooks it to BGP so it can be used as Adj-RIB-Out. When enabled, all
exported (post-filtered) routes are stored there. An export table can be
examined using e.g. 'show route export table bgp1.ipv4'.

Add option to send solicited router advertisements as unicast directly
to soliciting nodes instead of as multicast to all-nodes group.

Allow to not only use set literals in path masks, but also existing
set constants or set expressions.

Several BGP channel options (including 'next hop self') could be
reconfigured without session reset, with just route refeed/refresh.
The patch improves reconfiguration code to do it that way.

The 'deterministic med' option is implemented by suppressing other than
best-in-group routes (grouped by ASN) from best route selection. This
interferes with 'merge paths' as supressed routes are no longer mergable
with best route. This is fixed by suppressing only those routes that are
not mergable with best-in-group route.

 - add -flto only to default CFLAGS
 - add -fno-strict-aliasing, -fno-strict-overflow always
 - remove -Wno-implicit-fallthrough

The command initiating planned graceful restart including bird shutdown
should be called 'graceful restart' instead of 'graceful down', as the
later should be reserved for graceful shutdown in style of RFC 8326.

The formatting was broken due to longer date in 'since' column.