Merge pull request #1079 from AndrejMitrovic/Fix5065

Issue 5065 - Format specifier must be '%s' for some types
Merge pull request #1081 from AndrejMitrovic/Fix6668

Issue 6668 - Avoid throwing collateral exceptions in std.conv.to
DDoc: remove stray "
Merge pull request #1083 from NilsBossung/master

DDoc: remove stray "
Fixes Issue 8143 - Safe std.conv.to enum conversion.