[Migrants, who are waiting to cross the Greek-Macedonian border, sit outside a tent along a railway track during a foggy early morning near the village of Idomeni]By Lefteris Papadimas IDOMENI, Greece (Reuters) - Refugees and migrants stranded at Greece's border with Macedonia vowed to stay put on Tuesday, hours after the European Union and Turkey hailed a tentative accord to stop a scramble by hundreds of thousands of people to reach Europe from war zones. There was no sign the pressure was easing on Tuesday, as thousands of people queued up at Greece's northern border for Macedonia to open a border gate. At an EU summit on Monday, Turkish Prime Minister Ahmet Davutoglu told leaders of the bloc Ankara was willing to take back all migrants who enter Europe from Turkey in future in return for financial aid, faster EU entry talks and quicker visa-free travel for its citizens.