SirsiDynix announced today that Patrick Sommers is stepping down as chief executive officer, effective immediately. As you will recall, Vista Equity Partners recently acquired SirsiDynix. This was bound to bring some major changes, including this one. I asked Sommers directly in Seattle whether he would remain at the wheel under Vista’s ownership, and he claimed that he would, but I remained suspicious. Suffice it to say, I am not surprised. Perhaps the timing is a bit odd, but the announcement itself was pretty expected. It’s slightly unusual that a replacement was not immediately ready to step in. Martin Taylor, one …