ctkDICOMModelObject class and a test added
seqInsert and itemInsert modified
standard output streams commented
Class name changed to ctkDICOMObjectModel and some stylistic modifications
seqinsert and iteminsert methods combined in a new method tarverseDataElemnts. The code duplication for seqinsert and iteminsert is solved.
FIX: The method names for ctkDICOMObjectModelPrivate modified in order to resolve the qulification on
member error.
ctkDICOMOBjectModelTest1 added to the project
ENH: Hierarchy and VR added
FIX: Hierarchy enabled by changing the order of tag and VR in the model
ENH: Length added to the DICOM object model
ENH: Tag HEX added to the DICOM object model
ENH: View content is not editable
ENH: Column widths adjusted to contents in the example tree view
BUG: Hide error log "threadid" column by setting model column count

If not setting the column count, the column can be hidden only after
data have been inserted. As a consequence, within the error log widget,
the column is visibility is set only after the error log model is set.
ENH: Add convenience method allowing to show/hide any error log column.
Merge branch 'fix-threadid-errorlog-column-visibility'

* fix-threadid-errorlog-column-visibility:
  ENH: Add convenience method allowing to show/hide any error log column.
  BUG: Hide error log "threadid" column by setting model column count
Extend ctkDirectoryButton to optionally filter out readOnly folders.

For details see comment associated with acceptMode property.

See also CTK issue #365

Co-authored-by: Jean-Christophe Fillion-Robin <JChris.FillionR@kitware.com>
Merge branch '365-filter-out-read-only-directory'

* 365-filter-out-read-only-directory:
  Extend ctkDirectoryButton to optionally filter out readOnly folders.
Fix copy/paste in ctkConsole

In addition to support paste from Ctrl+V, it now supports any paste
(e.g. with middle mouse button).
Also, the behavior is changed to now support Ctrl+V even when
the cursor is in the history area. Pasted text is appended at the end of
the document.

Closes #294
Add private implementation to ctkCoordinatesWidget

Closes #355