S3 download links except for OSX
Correction of request to change `immutable` fields to `immutable`.

Not sure this is a correct correction.
Merge pull request #330 from denis-sh/patch-3

Correction of request to change `immutable` fields to `immutable`.
Add docs for documented unittests.
Add link to documented unittest page to the changelog.
Merge pull request #264 from AndrejMitrovic/DocumentUnittest

Add docs for documented unittests.
Merge pull request #331 from AndrejMitrovic/AddDocumentUnittestLink

Add link to documented unittest page to the changelog.
Add description about deprecated(message) feature
Improve some attribute descriptions
Merge pull request #318 from 9rnsr/fix_attrib

Improve descriptions for various attributes
OSX download also from S3
Fixes for latex generation
Update unittest.dd
fix (hopefully) a broken link to doxygen (add www)
Fix documentation
Merge pull request #332 from matovitch/patch-1

fix (hopefully) a broken link to doxygen (add www)
Move description for @disable this(this); to struct.dd
Add description for @disable this() feature
Add description for qualified constructor
Fix postblit grammar