#2913 TimeRangeSelector GUI isn't resizable

[Jeremy Faden]

Dave and I found that the TimeRangeSelector dialog is not resizable, so he couldn't change the spacecraft to see if the orbits file is loading properly.

1. run autoplot
2. flip over to time range selector (ctrl-T, blue button)
3. the orbits spacecraft selection might be obscured (is on Dave's)
4. the popup is not resizable.

[Jeremy Faden]

Fixing this is simply changing:
JOptionPane.showConfirmDialog to WindowManager.showConfirmDialog

I should go through and do this everywhere.

[Jeremy Faden]

I've gone through DataSource and changed all JOptionPane.showMessageDialog to WindowManager.showMessageDialog.

[Jeremy Faden]

There are many other places where this should be done, so I'm leaving this open.