why:
in the slim  value path is a package search path,and the 'import' operation need not has a path
so:
change the concept
why:
xe2 vs xe1
the rtti was changed
so:
make all the unit test pass
why:
sometimes SlimServer can't create an instance for a class
when the SlimServer receive an call instance
it should have a right response

do:
fix the bug in CallInstruction.Execute,when there was no class instance,it should response no_method_in_class