From Claudi Martinez:
- Removed unused fColumnNames[] and fColumnTypes[] arrays
- Fixed memory leak in LoadHDU()
- Added method: GetColumnName()
- New tutorial FITS_tutorial6.C


git-svn-id: https://root.cern.ch/svn/root/branches/v5-34-00-patches@49129 27541ba8-7e3a-0410-8455-c3a389f83636