Fix wrong index for argument length for query operations
Use pfc prefix in config file to set XrdFileCacheOptions.
Update configuration entry.
Merge pull request #172 from esindril/master

Fix wrong index for argument length for query operations
Make all options lowcase.
Make all options lowcase.
Rename buffersize to blocksize. Rename fileblockmode to filefragmentmode.
Use XrdSysError to print configuration status instead of XrdCl logger.
Rename variable from m_blockSize to m_fileFragmentSize.
Merge pull request #173 from alja/pfc-options

Improvements in XrdFileCache configuration
Make sure xrdcp legacy options -extreme and -x actually do what they claim.