COMP: Address PrincipalComponentsAnalysis review concerns

itk-module.cmake: pass DOCUMENTATION through to DESCRIPTION
(was overwritten by a literal string).

CMakeLists.txt: drop the cmake_policy(CMP0003) shim, the
itk_module_examples() call, and the doc-build option block —
examples and doc/ were intentionally not ingested.

LICENSE: remove the per-module copy; ITK's root LICENSE applies.

Author: hjmjohnson

Modules/Numerics/PrincipalComponentsAnalysis/CMakeLists.txt

@@ -1,21 +1,3 @@
-if(COMMAND CMAKE_POLICY)
-  cmake_policy(SET CMP0003 NEW)
-endif(COMMAND CMAKE_POLICY)
-
-set(PCA PrincipalComponentsAnalysis)
-project(${PCA})
+project(PrincipalComponentsAnalysis)
 
 itk_module_impl()
-
-itk_module_examples()
-
-cmake_dependent_option(
-  Module_${PCA}_BUILD_DOCUMENTATION
-  "Generate documentation from LaTeX files, source code examples and result screenshots"
-  OFF
-  "BUILD_DOCUMENTATION"
-  OFF
-)
-if(Module_${PCA}_BUILD_DOCUMENTATION)
-  add_subdirectory(doc)
-endif()

Modules/Numerics/PrincipalComponentsAnalysis/LICENSE

@@ -14,5 +14,5 @@ itk_module(
   TEST_DEPENDS
     ITKTestKernel
   EXCLUDE_FROM_DEFAULT
-  DESCRIPTION "Module ingested from upstream."
+  DESCRIPTION "${DOCUMENTATION}"
 )