Added #define AVH_NO_NEXUS to compile NS without Nexus
Temporarily #define'd AVH_PLAYTEST_BUILD to automatically #define AVH_NO_NEXUS
Fixed Balance.h ordering issues that became apparent when BALANCE_ENABLED is #define'd.
git-svn-id: https://unknownworlds.svn.cloudforge.com/ns1@106 67975925-1194-0748-b3d5-c16f83f1a3a1