PLINK2-88: TCCL cache/swap for JAXP operations
Merge pull request #180 from anilsaldhana/master

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PLINK2-88: use XMLInputFactory.newInstance() for older wst stax implementation
Merge pull request #181 from anilsaldhana/master

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PLINK2-88: use XMLoutputFactory.newInstance() for older wst stax implementation
Merge pull request #182 from anilsaldhana/master

see comments