Add widgets for additional reconstruction options
Use GUI parameter values during reconstruction
Replace signal blocking with save skipping

I found it to be bad form to block signals from the widgets while
loading, because some widgets signals do important things like
change the size of arrays. I realized that all I really wanted to
prevent was saving while loading, so I replaced the signal blocking
mechanism with a simple boolean whether to skip saving. During
loading, the save defaults routine will still be invoked, but it
will be skipped if this flag is set.
Add new RC3D options to the parameters file