ENH: Reducing the number of Loggers created in a ModelBuilder Session

* The issue was that the Attribute XML I/O code created their own Loggers instead of using the ones passed into the AttributeReader/Attribute/Writer classes. This mod changes this.
* Also removed internal XML related classes from being wrapped.
* Added a clearErrors method to the Logger to reset its error bit.
Status Job ID Name Coverage
  External
passed cdash

passed ghostflow-branch-check-master

passed ghostflow-branch-check-release

failed smtk@master-kerbin-windows-shared-release+examples+remus

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+private+remus

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+python3+remus+vtk

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+remus

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+remus+vtk

passed smtk@master-norkit-osx-shared-release+examples+matplotlib

failed smtk@master-praxis-windows-shared-release

failed smtk@master-talosiv-osx-shared-release+examples+matplotlib

failed smtk@master-tatooine-osx-shared-release+examples+matplotlib

failed smtk@master-tatooine-osx-shared-release+examples+matplotlib+private

failed smtk@release-moho-linux-shared-relwithdebinfo+remus

running smtk@release-praxis-windows-shared-release

760:50:39

passed cdash

passed cdash

passed cdash

failed smtk@master-kerbin-windows-shared-release+examples+remus

00:00:58

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+private+remus

00:04:54

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+python3+remus+vtk

00:00:03

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+remus

00:04:57

failed smtk@master-moho-linux-shared-relwithdebinfo+examples+remus+vtk

00:04:52

passed smtk@master-norkit-osx-shared-release+examples+matplotlib

00:02:14

failed smtk@master-praxis-windows-shared-release

00:03:10

failed smtk@master-talosiv-osx-shared-release+examples+matplotlib

00:07:10

failed smtk@master-tatooine-osx-shared-release+examples+matplotlib

00:02:36

failed smtk@master-tatooine-osx-shared-release+examples+matplotlib+private

00:02:57

failed smtk@release-moho-linux-shared-relwithdebinfo+remus

00:00:04