sub-programs:
assemble
assemble from SdBG
local local asssembly
iterate
extract iterative edges
buildlib
build read library
count kmer counting
read2sdbg
build sdbg from reads
seq2sdbg
build sdbg from megahit contigs + edges
contig2fastg
convert MEGAHIT's k*.contigs.fa to fastg format
readstat
calculate read stats (# of reads, bases, longest, shortest, average)
filterbylen
filter contigs by length
checkcpu
check whether the run-time CPU supports POPCNT and BMI2
checkpopcnt
check whether the run-time CPU supports POPCNT
checkbmi2
check whether the run-time CPU supports BMI2
dumpversion
dump version
kmax the largest k value supported