Use class enums and constants rather than global enums and define

Fix a bug : virtual transferts must not be considered as a debit

src/model/import/GrisbiImportEngine.cpp

@@ -97,7 +97,7 @@ void GrisbiImportEngine::LoadCategory(GrisbiImportEngine* _this, const char** at
     cat.id = id;
     cat.name = name;
     cat.parent = wxT("0");
-    cat.backcolor = OWN_GREEN ; 
+    cat.backcolor = view::OWN_GREEN ; 
     cat.forecolor = *wxBLACK; 
     cat.fix_cost = false;
     _this->_unresolvedCategories.push_back(cat);

src/model/import/ImportEngine.cpp

@@ -19,6 +19,8 @@
 
 #include "ImportEngine.h"
 
+wxString ImportEngine::NULL_IMPORT_PATTERN = wxT("(nil)");
+
 ImportEngine::ImportEngine()
 {
 }

src/model/import/ImportEngine.h

@@ -33,10 +33,10 @@ public:
     wxString category;
 } ;
 
-#define NULL_IMPORT_PATTERN wxT("(nil)")
-
 class ImportEngine {
 public:
+    static wxString NULL_IMPORT_PATTERN;
+
     ImportEngine();
     ~ImportEngine();