Some elements flipped via "X" command do not survive save/reload

In current builds, if you add a staff text to a score then flip it below the staff with "X", then save and reload, the flip is lost. It works if you use the Inspector instead. But fermatas work. Similarly, tuplets fail, but lyrics work. I recommend going through cmdFlip() in edit.cpp and going through each element type to see which fail, and fixing them. It's a loss of data, so I'm marking P0.