createOrUpdate for field types and record types

[evert]

Support createOrUpdate mechanism for field types and record types like for records.

See also #156 and #227

[bruno]

In [5103]:

Extended RecordTypeBuilder? and added TypeManager?.createOrUpdateFieldType and TypeManager?.createOrUpdateRecordType (re #242).

RecordTypeBuilder? now has:

• inline creation of field types through sub-builder
• adding field types by name instead of id
• adding mixins (by name and id)
• field type entries and mixins are added through sub-builders
• names can be specified in various ways (relying on defaultNamespace, as QName objet, as two strings)
• createOrUpdate for both field types and record types: makes that the code doesn't fail if the schema was already created earlier.

Concerning the createOrUpdate methods: to make these usable in the import library, they should return a response status as is the case for records. Only difficulty there is that we should probably avoid that that ends up in the cache, to avoid confusion.

Other changes:

• added TypeManager?.createFieldType and newFieldType methods which takes the value type as string
• misc small improvements in HBaseTypeManager (better arg checking, exception messages, don't use exception to check if field type exists, ...)
• TypeManager?.updateRecordType: allow to supply object with only name and no id
• TypeManager?.update(Field|RecordType?): clear name reservation in case exceptions occur (e.g. field type immutable attributes conflict)
• handle missing scope & valuetype in field type on update
• AbstractTypeManager?.newFieldType: don't validate arguments to be non-null, they can set to null afterwards anyway.