By Gregg WendorfAdvance News JournalThe more things change, the more they stay the same.Except for something like the price of a stamp, or the question of how much longer the McAllen post office will remain in full operation at the corner of McColl and Pecan.In the spring, early summer of 2006, the USPS was causing a stir with some Valley residents, especially those in McAllen, by proposing that the McAllen post office might undergo an internal switch — mail processed at the McAllen plant would be driven instead to a Corpus USPS facility, processed, and driven back to McAllen for ...