langString implementation fixes for forms and domain.xqy
application.xqy - Added language inclusion
domain.xsd - Added domain:language to schema
form-helper.xqy - added fix to support langString
model-helper.xqy - Fixed issue in multi-occurrence values not getting represented correctly

domain.xqy - fixed link to semantics api.
added support for proper handling of langstring

base-model.xqy - Removed xs:boolean return value on delete.
switched all directory-queries to use domain:base-query
Merge branch 'master' of https://github.com/nativelogix/xquerrail2.framework