Fix thread count setting for 1.9 wesnothd and add one for 1.12
create_symlinks: Make an exception for 1.10
remove unused attributes from carryover sides
add a comment
remove unused function
fix mp wrong defautl controllers

the old code resulted in human sides beeing ai by default for
stat-of-scenaro saves in the mp connect dialog.
remove saved_game operator =

this assignment operator is not better than the defult operator.
add a warning log message.
Merge branch 'master' of https://github.com/wesnoth/wesnoth