network: support for with color and player name in NET_REQUEST_PLAYER

send player and client data and client names in NET_SERVER_STATUS
server: removed previously implemented forced delay after setting stone

was used to delay the *first* computer move after a human player. has been replaced
by a forced delay after each computer move.
spielserver: support color wish for 2 player 2 color mode
spielserver: don't send preset "Client x" as client name when name is empty. send empty string instead.

allows clients to assign a default name, if name is unset
network: don't send SIGPIPE when sending network data
Merge branch 'names'
introduce enum value and dialog entry GAMEMODE_DUO for blokus duo
refactoring to allow for game mode depending seeding
correct seeding for GAMEMODE_DUO
spielclient: remove debug output about client names
dedicated: allow option to create blokus duo games
server: fix wrong 2 player color assigning code
spielserver: don't use AI_ALL and AI_ADDRCONFIG

these flags prevent getaddrinfo from returning any addresses in Android
Merge branch 'duo'