Allow using wxLOCALE_CAT_DEFAULT for numeric or money locale info

Make GetInfo() return information for numbers by default in the Unix
version too instead of asserting, as this is more consistent with the
MSW and Mac versions and also seems more useful.

interface/wx/intl.h

@@ -116,6 +116,9 @@ enum wxLocaleInfo
 
         This value can be used with either wxLOCALE_CAT_NUMBER or
         wxLOCALE_CAT_MONEY categories.
+
+        By default, i.e. when wxLOCALE_CAT_DEFAULT is used, the separator for
+        numbers is returned.
      */
     wxLOCALE_THOUSANDS_SEP,
 
@@ -124,6 +127,9 @@ enum wxLocaleInfo
 
         This value can be used with either wxLOCALE_CAT_NUMBER or
         wxLOCALE_CAT_MONEY categories.
+
+        By default, i.e. when wxLOCALE_CAT_DEFAULT is used, the decimal point
+        for numbers is returned.
      */
     wxLOCALE_DECIMAL_POINT,