[lua] Fix a bug in SWIG_ALLOC_ARRAY()

improved the error messages for incorrect arguments.
Changed the output of swig_type() to use the human readable form of the type, rather than the raw swig type.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@9863 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/lua/li_std_vector_runme.lua

@@ -43,7 +43,7 @@ for i=0,3 do
 end
 
 for i=0,3 do
-	assert( swig_type(sv[i]) =='_p_Struct' and sv[i].num==i)
+	assert( swig_type(sv[i]) =='Struct *' and sv[i].num==i)
 end
 
 -- range checking