Merge branch 'next'

* next:
  minor, provide README.md
  chore, provide travis ci config file
  fix, PEBKAC, when accept()ing dccp connections, default to sockaddr_storage size for the socklen_t arg
  cosmetics, output the uidx along with the address of si upon PUSH  SQ
  fix, PEBKAC, in sub's find_uidx() actually compare the uidx slots
  fix, PEBKAC, use inet_ntop() how it's supposed to be used
  cosmetics, adhere to COMMAND 2*SPC policy in quo-tws' logger output
  minor, allow secdefs to multiply, ...
  minor, also engrave the sdef req's oid in the s == NULL case in pre_cb() TWS_CB_PRE_CONT_DTL
  Revert "cosmetics, swap likely and unlikely branch around for clarity"
  cosmetics, swap likely and unlikely branch around for clarity
  minor, in TWS_CB_PRE_CONT_DTL case of pre_cb() find sub via sreq and not by nick
  chore, adapt __sub_sdef() to tws_req_sdef() signature change
  minor, change signature of tws_req_sdef() to return a tws_oid_t
  chore, document fields of a sub_s object
  minor, keep track of sdef request ids in sub objects
  minor, provide another way to generate nicks through symbol and currency
  minor, change advertiser uri depending on socket protocol
  minor, provide getsock_proto() to see what proto has been used for ipv6 sockets
chore, list README.md file in EXTRA_DIST

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'bld/dist' into next

* bld/dist:
  chore, list README.md file in EXTRA_DIST