fix Issue 9198 - Vararg functions don't respect IFTI rules
fix Issue 6905 - ref acts as auto ref when return type is missing
drop 'www.' from dlang.org urls
switch ddoc references from digitalmars to dlang
fix up file header comment

1) drop obsolete links to dsource
2) drop path to backendlicense.txt
3) update readme.txt to point to dlang.org
expression.c got out of date
add test case for
Issue 5978 - ICE(mtype.c) when calling __traits(parent) on the child of an anonymous function.
Issue 5978 - ICE(mtype.c) when calling __traits(parent) on the child of an anonymous function.
Merge pull request #1444 from WalterBright/test5978

add test case for issue 5978
Merge pull request #1425 from braddr/fix-urls

Fix urls
Merge pull request #1441 from WalterBright/b1

refactor stack offset code
Merge pull request #1401 from 9rnsr/fix6905

Issue 6905 - ref acts as auto ref when return type is missing
Merge pull request #1399 from 9rnsr/fix9198

Issue 9198 - Vararg functions don't respect IFTI rules
fix Issue 9273 - DMD segfaults with templated ctors in implicit super call
fix Issue 9284 - DMD segfaults with templated ctors in constructor delegation
Merge pull request #1446 from AndrejMitrovic/RemoveAnonStruct

Remove unused AnonymousAggregateDeclaration
Merge pull request #1451 from 9rnsr/fix9273

Issue 9273 & 9284 - DMD segfaults with templated ctors
Fixes Issue 7829 - Function traits should be usable with subtyping.