Update ITK External superbuild to ITK 4.7rc01

Change-Id: Ifa68bb87828e658cd0a0412a11db8f9c40fb5549
Updating ITK superbuild towards 4.7rc2

Change-Id: I2efe755b62ade6b397027aa41853428eb7e69f05
ENH: Updating JSON from ITK doxygen

Pull ITK doxygen XML from ITK tag
8fc6ca89bfd3a5af8b19714c18b9af063b4a5516, which expected to be right
before tag 4.7rc02.

Change-Id: I5546d421e7b9bf4e414fe62946f818b3638a8818
Add Doygen grouping to overloaded procedural methods

Change-Id: Ib59ed4591b748e40032a3fb895b661f9132a4155
Adds space before for ulink doxygen nodes to SWIG

There was a missing space before URLs in the SWIG dot i files. This
updates the generator to add the space.

Change-Id: I21b887a34d795fd3165403fa05e107648c1c5f3a
Updating SWIG doc strings from latest updated json files.

Change-Id: I09e1fc9df11d664989b07e7618734fe5cc9ebe0a
Update to v4.7rc01 tag for ITK superbuild

Change-Id: I76e79d30265cdd8a39abe3016aeca8fce8d6f5e8
Merge branch 'SIMPLEITK-585_UpdateToITK4.7' into release

* SIMPLEITK-585_UpdateToITK4.7:
  Update to v4.7rc01 tag for ITK superbuild
  Updating ITK superbuild towards 4.7rc2
  Update ITK External superbuild to ITK 4.7rc01

Change-Id: I9f3bbe1564b7cf7f42ad88b5363ce8fb6324d574
Merge branch 'SIMPLEITK-586_UpdateJSONDoxygenStrings' into release

* SIMPLEITK-586_UpdateJSONDoxygenStrings:
  Updating SWIG doc strings from latest updated json files.
  Adds space before for ulink doxygen nodes to SWIG
  Add Doygen grouping to overloaded procedural methods
  ENH: Updating JSON from ITK doxygen

Change-Id: I36f97e80fdcd371e6627990fbf785d686fad244f