Various changes to bring pm.lua test closer to passing:

* New and complete character class support
 * string.gsub implemented
 * rawset implemented
 * lua_call added (based on lua_pcall)
 * lua_pop added
 * newCall removed; luaGetTable and luaSetTable in LFunction updated to
   use lua_call instead.
 * StandardTest changed to avoid an ArrayIndexOutOfBoundsException

Unfortunately I discovered a problem where execute() will loop around too
many times and call exec() with a call frame that has already completed.
This might be due to the lack of the "tailcalls" field in our CallInfo class
that the C version maintains?

src/main/java/lua/value/LFunction.java

@@ -12,27 +12,18 @@ public class LFunction extends LValue {
 	}
 
 	public void luaSetTable(VM vm, LValue table, LValue key, LValue val) {
-		vm.newCall();
 		vm.push( this );
 		vm.push( table );
 		vm.push( key );
 		vm.push( val );
-		vm.setExpectedResultCount( 0 );
-		if ( this.luaStackCall( vm ) )
-			vm.execute();
-		else
-			vm.adjustResults();
+		vm.lua_call( 3, 0 );
 	}
 
 	public void luaGetTable(VM vm, LValue table, LValue key) {
-		vm.newCall();
 		vm.push( this );
 		vm.push( table );
 		vm.push( key );
-		vm.setExpectedResultCount( 1 );
-		if ( this.luaStackCall( vm ) )
-			vm.execute();
-		vm.adjustResults();
+		vm.lua_call( 2, 1 );
 	}
 	
 	public LString luaGetType() {