Imports of treetex command

PathSynopsis
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/google/trillian/merkle
github.com/google/trillian/merkle/compact
logPackage log implements a simple logging package.
math/bitsPackage bits implements bit counting and manipulation functions for the predeclared unsigned integer types.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.