@param fp File handle of the data file whose index is being opened
@param fn BAM/CRAM/etc filename to search alongside for the index file
@return The index, or NULL if an error occurred.
Equivalent to sam_index_load3(fp, fn, NULL, HTS_IDX_SAVE_REMOTE);
@param fp File handle of the data file whose index is being opened @param fn BAM/CRAM/etc filename to search alongside for the index file @return The index, or NULL if an error occurred.
Equivalent to sam_index_load3(fp, fn, NULL, HTS_IDX_SAVE_REMOTE);