changed bootstrapping code and compiler code to weave top-level namespace hierarchy more consistantly, mostly related to the System class and its intrinsic namespace dictionary linked via the nsdic field
supported | .. | style declartion at the class level.
added the RDONLY flag to the object header
wrote some code to support default values for class-level variables such as instance variables
allowed the #primitive modifier in a method definition not associated with an external module.
fixed a bug in handling soft failure from numbered primitive functions
enhanced the system to be able to attach trailing spaces to an object upon instantiation, especially for external modules to be able to secure GC-safe free workspace inside an instantiated object
added moo_setclasstrsize(), moo_getobjtrailer() for the trailer feature
