Common: fix subtle project path bug when loading sym-linked project files.

* Assuming: a project exists in /a/b/project.pro, and /a/b is symlinked to
  /a/c

  1. Load /a/b/project.pro
  2. Load /a/c/project.pro

  Expectation: file name switches to /a/c/project.pro (even though they are
  the same file, a user would expect the path to reflect the file selection
  they just made)

  Reality: file name does not switch

  This is because PROJECT::SetProjectFullName() does not do anything if the
  path is not changed, and it uses wxFileName::SameAs() to check this. For
  some bizarre reason, wxFileName::SameAs compares filesystem inodes rather
  than actual paths.

  This patch instead creates a second wxFileName from the candidate name in
  order to normalize the path, and then compares paths directly. This should
  be much more in line with what a user would expect.

common/project.cpp

@@ -63,9 +63,13 @@ PROJECT::~PROJECT()
 
 void PROJECT::SetProjectFullName( const wxString& aFullPathAndName )
 {
+    // Compare paths, rather than inodes, to be less surprising to the user.
+    // Create a temporary wxFileName to normalize the path
+    wxFileName candidate_path( aFullPathAndName );
+
     // Edge transitions only.  This is what clears the project
     // data using the Clear() function.
-    if( m_project_name != aFullPathAndName )
+    if( m_project_name.GetFullPath() != candidate_path.GetFullPath() )
     {
         Clear();            // clear the data when the project changes.