fix test environment variable settings for module jbi
add Serializable interfece to OModel classes
trival commit, cleaning code
switch format form final int to enum; added java serializer
add visitor method to ExtensibleImpl. but seems useless...
migration from old Omodel classes to new ones, preliminary tests passed.
migration and deep equality code. not working properly though
change OmOld2New as visitor
Deep Equality worked; passed some tests of migration from old to new.
a little simplify on deep equality of debuginfo
cleanning code
fix DebugInfo readObject bug
trival cleaning and unify
modification in serialize api. needs review...