Client changes.
Merge branch 'master' of https://github.com/YanyanZ/AlcoloBattle2

Conflicts:
	knowledge/client.mlkb
Merge conflict fixed.
Client minor changes.
Merge branch 'master' of https://github.com/YanyanZ/AlcoloBattle2
Security handling.
Merge branch 'master' of https://github.com/YanyanZ/AlcoloBattle2

Conflicts:
	decision/secu.mlbt
Go out effective.