Some improvements on RNG schemes for metadata: deny deletion and change its name and by default, set its type to metadata RNG schema.
Create skeleton for managemetadata + constructor
Merge branch 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex into feature/ximdex-metadata

* 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex: (23 commits)
  Some improvements on RNG schemes for metadata: deny deletion and change its name and by default, set its type to metadata RNG schema.
  Minor changes on Xtags template and action.
  Adding correct type tag when creating a new tag - OntologyBrowser
  Changing button for anchor in main-action - OntologyBrowser
  Minor issue
  Puts back to suggested tags list the tags being removed from selected list
  Adding multi-tab functionality in OntologyBrowser
  Showing elements in OntologyBrowser widget with no childrens
  Fixes document tag list cannot be persisted with no tags
  Fixes new tags to be added in other tab taglist when there are more than one tags tab opened
  Fixes tags input widget to be instantiate twice in the same action
  Adding selectors to navigate over schema.org taxonomies
  Adding full schema.org ontology
  Fixing comments
  Recovered RelTagsDescriptions files
  Adding support to hidden nodes
  New entry on Namespaces table for the OntologyBrowser
  Deleting some unuseful classes for ximTAGS module.
  Updating getSectionPath
  Supporting rdf as default extension like xml
  ...
New class to manage the metadata in Ximdex CMS
Merge branch 'feature/ximdex-metadata' of https://github.com/XIMDEX/ximdex into feature/ximdex-metadata
Improving manager class for metadata creation and deletion.
New classes and table in the data model to manage metadata with Versions of the documents and not only idNodes.
Fixing some minor errors and performing in cascade the methods add and delete relations into the datamodel.
Improve managemetadata: loading RNGs fields for ImageNode into the form
Merge branch 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex into feature/ximdex-metadata

* 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex:
  Fixing some minor errors and performing in cascade the methods add and delete relations into the datamodel.
  New classes and table in the data model to manage metadata with Versions of the documents and not only idNodes.
  Improving manager class for metadata creation and deletion.
Merge branch 'develop' of github.com:XIMDEX/ximdex into feature/ximdex-metadata

* 'develop' of github.com:XIMDEX/ximdex:
  Supporint several tabs in modify server action
  Fixing bug in channel selection in modify server action
  Adding path to session cookie
  Adding support to messages in workflow_backward action
  Adding 3.5 format to workflow_forward template
  Support to notifications in every action. Adding 2 notification ways: email and messages.
New class for Common nodes in order to create metadata info. New method to get the proper RNG (for now, image-metadata.xml) when several projects are installed. Also, some bugs fixed.
Choose the proper RNG schema depending on the nodetype of the node.
Recovering correct RNG nodeid when ManageMetadata action is loaded
Changing log messages to the XMD log manager and allowing to create metadata files for XML documents.
Hidding metadata schemes when creating a new XML document.
Implementing parser service for building form elements based on RNG schema
Merge branch 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex into feature/ximdex-metadata

* 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex:
  Hidding metadata schemes when creating a new XML document.
  Changing log messages to the XMD log manager and allowing to create metadata files for XML documents.
Minor changes to create metadata files for binary documents.
[GUI] Change ellipsis for path to the beginning of the string, and adding the tooltip with the full path.