Use proper dap4 extensions
Merge branch 'target-4.3.17' of https://github.com/Unidata/thredds into target-4.3.17
Look for env variable JNA_PATH under certain circumstances
Merge branch 'target-4.3.17' of https://github.com/Unidata/thredds into target-4.3.17
Merge branch 'target-4.3.17' of https://github.com/Unidata/thredds into target-4.3.17