#164 XMLFileManipulator's loopWrite method is very inefficient

[Remy Chi Jian Suen]

There is an excessive amount of string concatenation being performed in this method. Java strings are immutable. Every call to += or + will instantiate a new StringBuffer with the appropriate 'append' method being called. This is horribly inefficient. The method should be altered to use a StringBuffer instead.

[Remy Chi Jian Suen]

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Fix released to HEAD.