make tests green; better output for when megatest execution fails

tests/manyloc/keineschweine/lib/estreams.nim

@@ -106,7 +106,7 @@ proc readChar*(buffer: PBuffer): char {.inline.} = return readInt8(buffer).char
 proc readBool*(buffer: PBuffer): bool {.inline.} = return readInt8(buffer).bool
 
 
-when true:
+when false:
   var b = newBuffer(100)
   var str = "hello there"
   b.write str

tests/manyloc/keineschweine/lib/map_filter.nim

@@ -17,7 +17,7 @@ template unless*(condition: untyped; body: untyped) {.dirty.} =
   if not condition:
     body
 
-when true:
+when false:
   proc dumpSeq[T](x: seq[T]) =
     for index, item in x.pairs:
       echo index, " ", item