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
set STACKALIGN for all targets
no longer need 2 passes
Fixes Issue 9191 - Wrong diagnostic on failing override.

For failing overrides the compiler should look for similar symbols in the
base classes and interfaces, and not the current class.
Merge pull request #1436 from AndrejMitrovic/Fix9191

Issue 9191 - Wrong diagnostic on failing override
Merge pull request #1434 from 9rnsr/fix9268

Issue 9268 - [ice-on-invalid] void assignment in fail44.d no longer caught in frontend
refactor; remove use of SCtmp
Merge branch 'master' of github.com:D-Programming-Language/dmd
strike SCtmp and FLtmp from all monuments
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)
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
fix Issue 9155 - Ddoc: code section should strip leading spaces