Fix metric autoscaling (#92)

Author: owiecc

src/cformat.jl

@@ -209,7 +209,7 @@ function format( x::T;
                     ( 1e-6,  "μ" ),
                     ( 1e-3,  "m" ) ]
                 for (mag,sym) in smallscales
-                    if abs(x) < mag*10
+                    if abs(x) < mag*1000
                         x /= mag
                         suffix = string(sym, suffix)
                         break

test/cformat.jl

@@ -130,6 +130,8 @@ end
     @test format( 1.2e6, autoscale = :metric ) == "1.2M"
     @test format( 1.2e3, autoscale = :metric ) == "1.2k"
     @test format( 1.2e-6, autoscale = :metric ) == "1.2μ"
+    @test format( 1.2e-7, autoscale = :metric ) == "120n"
+    @test format( 1.2e-8, autoscale = :metric ) == "12n"
     @test format( 1.2e-9, autoscale = :metric ) == "1.2n"
     @test format( 1.2e-12, autoscale = :metric ) == "1.2p"