type-traits: fix string equivalences

Add missing spaces, which should fix some equivalence detection in the defaults_eraser function

Author: iMichka

src/pygccxml/declarations/type_traits.py

@@ -482,22 +482,28 @@ def is_fundamental(type_):
 
 string_equivalences = [
     (
-        '::std::basic_string<char,std::char_traits<char>,'
-        'std::allocator<char>>'),
-    '::std::basic_string<char>', '::std::string']
+        '::std::basic_string<char, std::char_traits<char>, '
+        'std::allocator<char>>'
+    ),
+    '::std::basic_string<char>',
+    '::std::string'
+    ]
 
 wstring_equivalences = [
     (
-        '::std::basic_string<wchar_t,std::char_traits<wchar_t>,' +
-        'std::allocator<wchar_t>>'),
-    '::std::basic_string<wchar_t>', '::std::wstring']
+        '::std::basic_string<wchar_t, std::char_traits<wchar_t>, '
+        'std::allocator<wchar_t>>'
+    ),
+    '::std::basic_string<wchar_t>',
+    '::std::wstring'
+    ]
 
 ostream_equivalences = [
-    '::std::basic_ostream<char,std::char_traits<char>>',
+    '::std::basic_ostream<char, std::char_traits<char>>',
     '::std::basic_ostream<char>', '::std::ostream']
 
 wostream_equivalences = [
-    '::std::basic_ostream<wchar_t,std::char_traits<wchar_t>>',
+    '::std::basic_ostream<wchar_t, std::char_traits<wchar_t>>',
     '::std::basic_ostream<wchar_t>', '::std::wostream']