Improve Error Messages

[sfreemire]

Error messages are not in line of sight and can be missed. There are two fields that display error strings. Some errors go to the field farthest from the field being updated.

• Consider moving all error messages to popup boxes.
• Consider changing input text field font color to red when entered value is not allowed. E.g., number over slider turns red, or entry field characters turn red.
• Consider using only one error field and putting it in a better place.
• Try not to increase overall height requirement for the display.