Complete implementation of time in seconds mode

[collin80]

There is now a mode that will turn time stamps into time in seconds instead of microseconds. Yes, this just adds a decimal point but it's handy for mere mortals who are used to seconds. It is currently only working in the main window frame view but should be persisted everywhere in the application.

[collin80]

Now seconds mode is implemented on main form, flow view, and graphing view as of V118. I believe these to be the only places that need it. But, keeping the issue open for a little bit in case there are other places that need it (double check)