* The default verbosity level of all Nix commands is now lvlInfo.

* Builder output is written to standard error by default.
  * The option `-B' is gone.
  * The option `-Q' suppresses builder output.

The result of this is that most Nix invocations shouldn't need any
flags w.r.t. logging.

src/nix-env/main.cc

@@ -704,9 +704,6 @@ static void opDefaultExpr(Globals & globals,
 
 void run(Strings args)
 {
-    /* Use a higher default verbosity (lvlInfo). */
-    verbosity = (Verbosity) ((int) verbosity + 1);
-
     Strings opFlags, opArgs;
     Operation op = 0;