Save an object as formatted JSON. This is a generic function with a method
for qcthat_IssueTestMatrix objects that preserves attributes and column
order.
Usage
SaveAsJSON(x, strJSONPath)
# Default S3 method
SaveAsJSON(x, strJSONPath)
# S3 method for class 'qcthat_IssueTestMatrix'
SaveAsJSON(x, strJSONPath)