IXMIQUILPAN, Mexico (Reuters) - Seamstress Paulina Gutierrez, an ethnic Otomi Indian, prayed every day for years for a miracle to reunite her with her two sons, who were smuggled into the United States as children and have lived in permanent fear of deportation back to Mexico. Now, thanks to a major immigration policy shift by U.S. President Barack Obama, she can barely contain her excitement at the prospect of once again hugging her two boys - and two grandchildren she has never met. Without papers to get back into the United States, Gutierrez' sons cannot visit her in Mexico. She...