Merge topic 'fix-more-warnings'

dc68951b Eliminate warning.
abf67c7c Use `_snprintf_s` instead of `_snprintf` on Windows.
61ac8eea Use the new qtmain policy.

CMakeLists.txt

 cmake_minimum_required (VERSION 2.8.10)
+cmake_policy(SET CMP0020 NEW)
 project(SMTK)
 
 #Add our Cmake directory to the module search path

smtk/model/Entity.cxx

@@ -164,7 +164,7 @@ int Entity::findOrAppendRelation(const smtk::util::UUID& r)
     {
     if (this->m_relations[i] == r)
       {
-      return i;
+      return static_cast<int>(i);
       }
     }
   int idx = static_cast<int>(this->m_relations.size());

smtk/model/ImportJSON.cxx

@@ -10,7 +10,7 @@
 #include <string.h>
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
-# define snprintf _snprintf
+# define snprintf(buf, cnt, fmt, ...) _snprintf_s(buf, cnt, cnt, fmt, __VA_ARGS__)
 #endif
 
 using namespace smtk::util;