Fix bug 7648 comment in `std.stdio.File` and add bug section to `std.file.slurp`.

Issue URL: http://d.puremagic.com/issues/show_bug.cgi?id=7648
Strip spaces.
Fix Issue 12600 - Variant should support coercion to bool.
std.math: Check if dmd-style inline asm is available
Duplicate pointsTo as "doesPointTo"
Implement "isUnionAliased"
Re-implement "pointsTo" as "doesPointTo"
Rename pointTo as doesPointTo, insert deprecated alias
Change pointsTo to mayPointTo and doesPointTo
Rewrite pointsTo documentation
Tweak min and max for yet more efficiency

I checked the generated assembly code, and it looks pretty damn good. I've not been able to achieve any better anyways.
Give DList correct reference semantics
Cover issue 12566
Fix issue 12771 - Variant opIndex for static arrays is not implemented.
std.json: ensure objects contain keys
Small code reduction in std.ascii.

We can have the comment only once, and it will still show up in the
docs.
Minor stylistic cleanup in std.ascii.
Merge pull request #2196 from jmdavis/ascii

Some minor cleanup in std.ascii
Merge pull request #2186 from Yoplitein/master

std.json: throw exception if a key does not exist
Avoid double lookup in opIndex for std.json.