Fix wrong unittests for std.conv.unsigned, signed
Use immutable integer to demonstrate removed qualification
Merge pull request #2662 from ntrel/signed-test

Fix wrong unittests for std.conv.unsigned, signed
std.range.package init

delete range.d

std.range : move traits

move concept

1. traits => concept
2. move manipulation into concept

update package import

update module name

remove range.traits import

remove some local imports

add _swapImpl

move _swapImpl

fix _swapImpl

fix hasSlicing

restore old hasSwappableElements

update unittests

update unitises

fix module name

fix pop****N

move interfaces

update unites

add import std.typetuple : staticMap

clean imports

rename local min to _min

remove wrong scope import

add until for unittests

update *.mac

update import

optimize DList import

move comment

remove private global selective imports

remove private global selective imports (interfaces)

remove new private stuff

add local imports

public import std.typecons : Flag, Yes, No;

concept => constraints

update scoped imports