Remove more system-micros stuff

basis/core-foundation/timers/timers.factor

@@ -1,7 +1,7 @@
 ! Copyright (C) 2008, 2010 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: alien.c-types alien.syntax system math kernel calendar
-core-foundation core-foundation.time ;
+core-foundation core-foundation.time calendar.unix ;
 IN: core-foundation.timers
 
 TYPEDEF: void* CFRunLoopTimerRef

basis/smtp/smtp.factor

@@ -188,7 +188,7 @@ ERROR: invalid-header-string string ;
         "<" %
         64 random-bits #
         "-" %
-        system-micros #
+        gmt timestamp>micros #
         "@" %
         smtp-domain get [ host-name ] unless* %
         ">" %

basis/tools/time/time-docs.factor

@@ -24,7 +24,7 @@ HELP: time
 { $values { "quot" quotation } }
 { $description "Runs a quotation, gathering statistics about method dispatch and garbage collection, and then prints the total run time." } ;
 
-{ benchmark system-micros time } related-words
+{ benchmark time } related-words
 
 HELP: collect-gc-events
 { $values { "quot" quotation } { "gc-events" "a sequence of " { $link gc-event } " instances" } }