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
Fix issue 9236 CTFE ice on switch + with(EnumType)

When it's with(Type), dont try to interpret it, it's a no-op.
Merge pull request #1440 from donc/ctfe9236_switchwith

9236 CTFE ice on switch + with(EnumType)
expression.c got out of date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