Don't wrap testTerm() with default arguments

The code is clearer without the extra function and with explicit
arguments.
Fix Issue 6998 - std.container.Array destroys...

... class instances
Add unittest for 12540
Remove Ref template which was undocumented, unused, and had a non-working implementation.
Merge pull request #2079 from monarchdodra/6998

Fix Issue 6998 - std.container.Array destroys class instances
Merge pull request #2080 from AndrejMitrovic/DeadCode

Remove Ref template
Merge pull request #2078 from ntrel/byLine-testTerm

[trivial] Simplify byLine unittest code
Merge pull request #2074 from dymk/fix-12540

Add unittest for 12540
Fix complexity in red-black tree documentation

For the existing implementation front() and opSlice() are O(1).
Merge pull request #2081 from Safety0ff/patch-2

Fix complexity in red-black tree documentation