Scale factor rounding causes popup dialog problems

[Nicklas Nordborg]

The scale factor is used to control sizes of popup windows in case the user's may want larger or smaller dialogs.

The scale is internally stored as a floating point with 1 indicating no change in scale. The problem is that the javascript uses parseInt() to parse out the value from the string meaning that scales below 1 become 0 resulting in BASE trying to open popup windows with width and height equal to 0.

This problem is probably what cause #1841 in the first place.

The workaround is to select a scale factor of at least 100.

[Nicklas Nordborg]

(In [6543]) Fixes #1851: Scale factor rounding causes popup dialog problems

Also fixed an issue when trying to open dialog that was bigger than screen size. The browser will not let you which is causing a possible large correction factor to be used the next time.