Give sum a seed capability
Eliminate _assertPred
std.digest: Publicly import LetterCase
Make std.utf.toUTFz safe and pure
Merge pull request #2023 from tom-tan/safe-pure-std-utf-toUTFz

Make std.utf.toUTFz safe and pure
Mark std.stdio.fopen and popen as trusted
Merge pull request #2022 from CyberShadow/std-digest-public-import

std.digest: Publicly import LetterCase
Merge pull request #2026 from tom-tan/trusted-std-stdio-fopen

Mark std.stdio.fopen and popen as trusted
Mark std.stdio.File.this, opAssign, open and popen as safe
Merge pull request #2027 from tom-tan/safe-std-stdio-File-this

Mark std.stdio.File.this, opAssign, open and popen as safe
 Issue 5870 - Debug code in SortedRange assumes it can always print the range
Merge pull request #1970 from monarchdodra/sumseed

Give sum a seed capability
Update range.d
Merge pull request #2028 from Infiltrator/patch-1

 Issue 5870 - Debug code in SortedRange assumes it can always print the ...
Fix DDoc typo.
Merge pull request #2031 from monarchdodra/ScopeBufferConst

Fix DDoc typo.
Merge pull request #2017 from andralex/datetime

std.datetime: eliminate _assertPred
OutBuffer is now an OutputRange
Merge pull request #2034 from WalterBright/OutBufferToOutputRange

OutBuffer is now an OutputRange
callback uses size_t not double

- Not sure why the curl internal double arguments
  are converted to size_t in the first place though.