BUG: kmc_tools cannot analyze pre+suf files, but kmc_dump could

[gyslovecj]

GCF_000392535.3_ASM39253v3_genomic.fna.gz For this test_data, which is downloaded from ncbi, we can use kmc (./kmc -k18 -ci1 -cs1 -fm -f filename outputname ./tmp_data) to generate .pre and .suf files, and then we can get a human-readable file with command(./kmc_dump outputname dumpfile). However, we cannot use kmc_tools to analyze these files.(./kmc_tools outputname outputname union tools_file)