References #2617: Fixed rounding issue where model used unrounded values while UI showed rounded values.  Fixed issue where initialization of slider clobbers initial filter state.

(cherry picked from commit 64a2e070c9e382947f7886756f4f6b6e519f9cb4)
References #2617: Text fields are now always shown with sliders.  Fixed bug where slider maximum drifts when the minimum is dragged around because of a rounding error.

(cherry picked from commit d656600020439044d23dfc582668f31f6404cb10)