update AA key requirements
Bump Visual D version to 0.3.39
Add missing semicolons to alias declarations
Functions with identical bodies are allowed to be merged by compiler.
Document unittest attributes.
Merge pull request #684 from quickfur/issue9655

Issue 9655: Functions with identical bodies are allowed to be merged by compiler.
Merge pull request #670 from MartinNowak/fix10045

update AA key requirements
Merge pull request #676 from rainers/bump_vdversion39

Bump Visual D version to 0.3.39
Merge pull request #685 from quickfur/unittest_attrs

Document unittest attributes.
Add missing semicolons
Merge pull request #677 from Hackerpilot/patch-1

Add missing semicolons to alias declarations
Revert "Document unittest attributes."
Improve AA doc

Update examples.
Add 2 headings.
Remove remaining uses of hash_t.
Improve wording in 'Construction or Assignment on Setting AA Entries'
section.
Merge pull request #686 from ntrel/aa-doc-fixes

Improve AA doc
Merge pull request #688 from D-Programming-Language/revert-685-unittest_attrs

Revert "Document unittest attributes."
Explain usage of attributed unittests.
Merge pull request #689 from quickfur/attr_unittest_2

Explain usage of attributed unittests.
fix Issue 13664 - Grammar does not allow @<template_instance> UDAs