usage: tgStoreCoverageStat -G gkpStore -T tigStore version -o output-prefix [-s genomeSize] ...
-G <G> Mandatory, path G to a gkpStore directory.
-T <T> <v> Mandatory, path T to a tigStore, and version V.
-o <name> Mandatory, prefix for output files.
-s <S> Optional, assume genome size S.
-n Do not update the tigStore (default = do update).
-u Do not estimate based on N50 (default = use N50).
-L Be leniant; don't require reads start at position zero.
No gatekeeper store (-G option) supplied.
No input tigStore (-T option) supplied.
No output prefix (-o option) supplied.