Fix 6735: splitLines ignores trailing delimiter

[Abscissa]

http://d.puremagic.com/issues/show_bug.cgi?id=6735

[andralex]

This is by design. The '\n' is considered a line terminator, not a separator, such that e.g. splitLines("\n") returns [ "" ], not [ "", "" ]. Both semantics are arguably good, but we shouldn't change from one to the other at this point.

What I suggest you do is add an optional second enum KeepTerminator : bool { no, yes } parameter (incidentally already defined in std.stdio). If true, keep the endlines with the string (similarly to Python's splitlines). Such a method would simplify the implementation of outdent.