fix invalid include paths, compilation warnings, update README.md

src/model/AddressBookModel.cpp

@@ -50,7 +50,7 @@ void AddressBookModel::endReset(){
     endResetModel();
 }
 
-int AddressBookModel::rowCount(const QModelIndex &parent) const
+int AddressBookModel::rowCount(const QModelIndex &) const
 {
     return m_addressBook->count();
 }

src/model/SubaddressAccountModel.cpp

@@ -49,7 +49,7 @@ void SubaddressAccountModel::endReset(){
     endResetModel();
 }
 
-int SubaddressAccountModel::rowCount(const QModelIndex &parent) const
+int SubaddressAccountModel::rowCount(const QModelIndex &) const
 {
     return m_subaddressAccount->count();
 }

src/model/SubaddressModel.cpp

@@ -50,7 +50,7 @@ void SubaddressModel::endReset(){
     endResetModel();
 }
 
-int SubaddressModel::rowCount(const QModelIndex &parent) const
+int SubaddressModel::rowCount(const QModelIndex &) const
 {
     return m_subaddress->count();
 }