Applied patch from jira issue - OFBIZ-7593 - Enforce noninstantiability to UtilNumber class. Thanks Rishi Solanki and Rohit Koushal for your contribution.

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1751307 13f79535-47bb-0310-9956-ffa450edef68
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