A pythonic sdDataPtr and implementation of fetchUtils into sdDataRead.py and sdDataTypes.py.
Merged in develop.
Rearranged code to check for None _before_ trying to read.
Revert "Rearranged code to check for None _before_ trying to read."

This reverts commit 6e909b20b57c6d7ba3e9dfcc10e48e82ea59a432.
Made hemi default to north and added hemichar.
Missed a self.
Revert "Missed a self."

This reverts commit 37dbaf16b08a8d962a1f4ecc0c8a6fcdd95eb84b.
Revert "Made hemi default to north and added hemichar."

This reverts commit 7a85fcbaa69fd5179b918a0ec80cbbf3e8e50687.
Merge branch 'develop' into feature_sdData_fetchUtils
Merge pull request #87 from vtsuperdarn/feature_sdData_fetchUtils

Incorporate fetchUtils in to sdData*