Fix issue 8792.

std.algorithm.joiner(ror).Result.save fails to copy over _valid_current,
resulting in a defective copy returned by .save.
Add unittest for issue 8792.
Unbreak the "install" target in Windows makefiles
std.net.curl: Implement seeking in basic HTTP requests

This enables reposting the data after a redirect, for example.
Update std/parallelism.d
Merge pull request #864 from beatgammit/patch-1

Update std/parallelism.d
Added deprecation messages to std.string.
Merge pull request #853 from quickfur/issue8792

Fix issue 8792
Fix wrong haystack emptiness check in simpleMindedFind.
Add unittest for issue 7992.
Coding style.
Merge pull request #852 from quickfur/issue7992

FIx issue 7992
Expanded test for issue# 8792.
Small tweak to Rebindable.

It should use inout rather than duplicating the get function for mutable
and const.
Minor style cleanup for Redindable.
Merge pull request #867 from jmdavis/rebindable

Small tweak to Rebindable
save consolidation
Merge pull request #834 from JakobOvrum/patch-1

Update COM header with CoInitializeEx
Merge pull request #855 from monarchdodra/slice1

Save fixes in std.range
Merge pull request #866 from jmdavis/tests

Expanded test for issue# 8792.