Fixed deprecation warnings while Nim compiles.

I just removed unsigned and changed a writeLn() call to writeLine() to
avoid the remaining deprecation warnings.

compiler/msgs.nim

@@ -828,7 +828,7 @@ proc quit(msg: TMsgKind) =
 proc log*(s: string) {.procvar.} =
   var f: File
   if open(f, "nimsuggest.log", fmAppend):
-    f.writeln(s)
+    f.writeLine(s)
     close(f)
 
 proc handleError(msg: TMsgKind, eh: TErrorHandling, s: string) =

compiler/vm.nim

@@ -15,7 +15,7 @@ const debugEchoCode = false
 import ast except getstr
 
 import
-  strutils, astalgo, msgs, vmdef, vmgen, nimsets, types, passes, unsigned,
+  strutils, astalgo, msgs, vmdef, vmgen, nimsets, types, passes,
   parser, vmdeps, idents, trees, renderer, options, transf, parseutils,
   vmmarshal
 

compiler/vmgen.nim

@@ -28,7 +28,7 @@
 # this copy depends on the involved types.
 
 import
-  unsigned, strutils, ast, astalgo, types, msgs, renderer, vmdef,
+  strutils, ast, astalgo, types, msgs, renderer, vmdef,
   trees, intsets, rodread, magicsys, options, lowerings
 
 from os import splitFile

lib/impure/rdstdin.nim

@@ -100,7 +100,7 @@ when defined(Windows):
     stdout.write "\n"
 
 else:
-  import linenoise, termios, unsigned
+  import linenoise, termios
 
   proc readLineFromStdin*(prompt: string): TaintedString {.
                           tags: [ReadIOEffect, WriteIOEffect].} =

lib/pure/nativesockets.nim

@@ -12,7 +12,7 @@
 
 # TODO: Clean up the exports a bit and everything else in general.
 
-import unsigned, os
+import os
 
 when hostOS == "solaris":
   {.passl: "-lsocket -lnsl".}

lib/pure/net.nim

@@ -10,7 +10,7 @@
 ## This module implements a high-level cross-platform sockets interface.
 
 {.deadCodeElim: on.}
-import nativesockets, os, strutils, unsigned, parseutils, times
+import nativesockets, os, strutils, parseutils, times
 export Port, `$`, `==`
 
 const useWinVersion = defined(Windows) or defined(nimdoc)

lib/pure/securehash.nim

@@ -7,8 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-import
-  strutils, unsigned
+import strutils
 
 const Sha1DigestSize = 20