Use ddoc-ed unittest feature
fix Issue 9976 - Needlessly large instantiation depth in std.typetuple algorithms
Make std.conv unittests independent of floating point rounding
DDoc: std.stdio.byLine documentation fix and examples.

Removed the redundant /// ditto and added two examples to make it obvious to a newcomer how a range is useful here.
Merge pull request #1327 from kiith-sa/patch-5

DDoc: std.stdio.byLine documentation fix and examples.
nits
Merge pull request #1303 from jpf91/unittest

Make std.conv unittests independent of floating point rounding
Merge pull request #1274 from 9rnsr/fix9976

Apply ddoc-ed unittest feature in std.typetuple, and fix issue 9976