Kill introduced again deprecated `WEB` macro.

This is a fixup for pull request #349.
Add note about version(unittest) being enabled with the -unittest switch.
Merge pull request #374 from AndrejMitrovic/VersionUnittests

Add note about version(unittest) being enabled with the -unittest switch.
Updated links to the existing documentation approaches

The links for Javadoc and embedded XML were broken and lead to void. They have been replaced with working ones.
Correction of external link for embedded XML
Merge pull request #377 from llucenic/patch-1

Updated links to the existing documentation approaches
add dll-linux.html
Merge pull request #375 from WalterBright/add-dll-linux

add dll-linux.html
Fix issue 11001 - Add documentation for __traits(getVirtualIndex).
Merge pull request #378 from Kapps/fix11001

Fix issue 11001 - Add documentation for __traits(getVirtualIndex).
add link to core_demangle.html
Merge pull request #379 from dawgfoto/addCoreDemangle

add link to core_demangle.html
Fixes Issue 11035 - Document lack of .stringof reliability.
Merge pull request #380 from AndrejMitrovic/Fix11036

Issue 11035 - Document lack of .stringof reliability.
Merge pull request #363 from denis-sh/fixup-pull-349

Kill introduced again deprecated `WEB` macro.