Review: std.logger

[Dragos Carp via Digitalmars-d]

>> +1 for not having the conditional log
>
> Not so sure about that. -- Andrei

I agree that the conditional could be useful. But I think that 
the current API definition where we already have some strange 
letter combinations ('l', 'c', 'f') is an one-way street, that 
throws away some good possibilities to extend it later. Should we 
keep adding cryptic letters? That is the reason why I think it is 
better to let out the conditional log for now.

errorIf - looks D-like
errorc  - is at most C-like

The argument that writef/-ln also contain some cryptic letters 
have historical reasons and should not motivate us to add some 
more.