Have XForms change form behavior if value of a numeric concept is out of normal or critical values

Currently XForms does the following action if a numeric concept is entered which has a value higher or lower than the absolute Low or High: Red Circle next to answer and does not let the form be entered

This ticket would have xforms behave the following way if the value is beyond the range of either the critical or normal levels, though it will still let the user save the form.

Critical Low or High: Shows (high) or (low), respectively, changes the question and answer text to bold and the HTML color defined in the global property xforms.critical_color (initially should be red)
Normal Low or High: Shows (high) or (low), respectively, changes the question and answer text to the HTML color defined in the global property xforms.normal_color (initially should be yellow/orange).