started to add glb, not complete
started to add glb to sub-types
should have implemented all cases now.
added rnadom type generator
added tests for glb and fixed some issues triggered by the tests
fixed some warnings
generate more types (1000)
fixed some warnings
Merge branches 'add-glb' and 'master' of https://github.com/impulse-org/pdb.values into add-glb
Fixed the infinite recursion in Type.glbWithExternal(Type).
Merge with master branch.
Merge branch 'add-glb'