change hashes of .hgtags

Commit 1091:c169aba21baf (was 1091:cf94df2f84d5)
had empty change of file src/tool/blast_union.br
in old mercurial repo.
When converted hg -> git -> hg, hashes of all
commits after that commit were changed.
README: short command to build Linux and Windows packages
remove confusing period after command
update npge.ico and add multiple layers