func Int64(name string, value int64, usage string) *int64 {
	return EnvironmentFlags.Int64(name, value, usage)
}
Int64 defines an int64 flag with specified name, default value, and
usage string.  The return value is the address of an int64 variable
that stores the value of the flag.
package envflag
import (
	"flag"
	"fmt"
	"os"
	"strings"
	"time"
)
func VisitAll(fn func(*flag.Flag)) {
	EnvironmentFlags.VisitAll(fn)
}
func Visit(fn func(*flag.Flag)) {
	EnvironmentFlags.Visit(fn)
}
func Lookup(name string) *flag.Flag {
	return EnvironmentFlags.Lookup(name)
}
func Set(name, value string) error {
	return EnvironmentFlags.Set(name, value)
}
func BoolVar(p *bool, name string, value bool, usage string) {
	EnvironmentFlags.BoolVar(p, name, value, usage)
}
func Bool(name string, value bool, usage string) *bool {
	return EnvironmentFlags.Bool(name, value, usage)
}
func IntVar(p *int, name string, value int, usage string) {
	EnvironmentFlags.IntVar(p, name, value, usage)
}
func Int(name string, value int, usage string) *int {
	return EnvironmentFlags.Int(name, value, usage)
}
func Int64Var(p *int64, name string, value int64, usage string) {
	EnvironmentFlags.Int64Var(p, name, value, usage)
}