Remove undocumented structuralCast in std.exception
fix Issue 4999 - Add Kenji Hara's adaptTo() to Phobos

Add structuralCast and structuralDownCast in std.typecons
Rename structuralCast to wrap, and structuralDownCast to unwrap
first pass of install targets
remove html generation for now, fix copy to not result in an extra layer of each subdir
Make Tuple.opAssign CTFEable
Detab and strip std.bitmanip.
Space after if
Merge pull request #1325 from youkei/fix_10218

Issue 10218 - std.typecons.opAssign is not CTFEable
Fixes Issue 4124 - Implement toString for BitArray.
Merge pull request #1144 from AndrejMitrovic/Fix4124

Issue 4124 - Implement toString for BitArray.
Move checkCTFEable to std.exception.assertCTFEable, and use it
fix Issue 10220 - `array` doesn't work with disabled default construction
Merge pull request #1265 from 9rnsr/structuralCast

Issue 4999 - Add Kenji Hara's adaptTo() to Phobos
Merge pull request #1324 from braddr/install

draft install target
Fix std.datetime (remove ReturnType usage for property check)
Fix internal template GetOverloadedMethods - should see overload first
Merge pull request #1331 from 9rnsr/fix1983

Supplemental change for Issue 1983 - Delegates violate const
Merge pull request #1329 from 9rnsr/fix10220

[REG2.064a] Issue 10220 - `array` doesn't work with disabled default construction