non-/64 subnets still needs Router Advertimenets for the
 default route & RDNSS.

Assign opt82_ses=ses if shared=0

to get radius object use session:module("radius") function
radius object provides flollowing functions:
radius:attrs() - returns array of attributes {"name" = NAME, "vendor" = VENDOR|nil}
radius:attr(name[,vendor]) - returns value of attribute (may return multiple results)

Example:
function ip_up(ses)
  rad = ses:module("radius")
  attrs = rad:attrs()
  if attrs then
      print("attrs:")
      for _,a in pairs(attrs) do
	  io.write("\t")
	  if a.vendor then io.write(a.vendor..":") end
	  io.write(a.name.."=")
	  print(rad:attr(a.name, a.vendor))
      end
  end
end

to access module specific object introduced new function session:module(NAME)

session object consists of following functions:
ifname() - interface name
ifindex() - interface ifindex
sid() - Acct-Session-ID
uptime() - session uptime in seconds
username()
ctrl_type() - type of session (pppt/pppoe/l2tp/ipoe)
calling_sid() - Calling-Station-ID
called_sid() - Called-Station-ID
ipv4() - retuns pair (peer address, local address)
ipv6() - ipv6 address or nil
rx_bytes()
tx_bytes()

Implemented support for lua 5.2/5.3.
To build accel-ppp with exact lua version pass it in -DLUA=x.y, for example -DLUA=5.2 (cmake 3.0 is required for this).
Old style -DLUA=TRUE supports only 5.1 and does not require cmake 3.0.
Also extra lua modules (lua_lpack, lua_bit) took out into separated library luasupp.

[ppppd-compat]
fork-limit=N

Specifies number of simultaneously running background processes.

Instead of entering working thread into sleep triton saves machine context and stack on sleep and restores context/stack on wakeup.
This saves costly new thread allocation.

implemented coinfig reload
changed default value of ip-xxx scripts to be NULL (disabled)

1 - is high priority queue for Access-Request and Account-Request(Start)
2 - is low priority queue for Account-Request(Alive) and Account-Request(Stop)
This patch intended to prioritize sessions connecting requests over disconnects and interim updates.

Now, if lcp-echo-timeout is specified this is considered as idle timeout.
So if link is idling (no any packet was received) in specified interval accel-ppp starts to send LCP Echo-Request with lcp-echo-interval period.
If peer responds to echo request new idle period is being started.
If peer does not responds to lcp-echo-failure attempts accel-ppp terminates session with Acct-Terminate-Cause Lost-Carrier.
If lcp-echo-timeout is not specified or equals zero accel-ppp works in old behaviour (unconditionally sends LCP Echo-Request with lcp-echo-interval period).
This patch intended to prevent unexpected sessions termination due to lcp echo loses.

fix: connection problem with clients having nomru option

Fixed problem while connecting with clients in which mru not
negotiating lcp option is set

introduced new config option:
[ipoe]
vendor=Name

this affects to all attributes specified in attr-xxx options

new config option:
[common]
max-sessions=N

If set then accel-pppd stops reply to new connection requests if total number of sessions (active and starting) is reached specified limit.

This reverts commit 88a90897.

new config option:
[common]
max-sessions=N

If set then accel-pppd stops reply to new connection requests if total number of sessions (active and starting) is reached specified limit.

This reverts commit 9ea88bac.