Revert "ENH: Update Qt4 minimum required version to 4.7"
Revert "ENH: Update Qt4 minimum required version to 4.7"

This reverts commit 2c94808a272545ae199bccf7e2c30d7e75d03c0d.

SINTEFMedtek/CTK,commontk/CTK,SINTEFMedtek/CTK,commontk/CTK,commontk/CTK,SINTEFMedtek/CTK,SINTEFMedtek/CTK,SINTEFMedtek/CTK,commontk/CTK