Remove extra/micros since we have this in the core now

extra/micros/authors.txt

@@ -1 +0,0 @@
-Phil Dawes

extra/micros/backend/backend.factor

@@ -1,4 +0,0 @@
-IN: micros.backend
-USING: io.backend ;
-    
-HOOK: (micros) io-backend ( -- n )

extra/micros/micros-docs.factor

@@ -1,14 +0,0 @@
-IN: micros
-USING: help.syntax help.markup kernel prettyprint sequences ;
-
-HELP: micros
-{ $values { "n" "an integer" } } 
-{ $description "Outputs the number of microseconds ellapsed since midnight January 1, 1970"
-} ;
-
-    
-HELP: micro-time
-{ $values { "quot" "a quot" }
-          { "n" "an integer" } }
-{ $description "executes the quotation and pushes the number of microseconds taken onto the stack"
-} ;

extra/micros/micros-tests.factor

@@ -1,7 +0,0 @@
-IN: micros.tests
-USING: micros tools.test math math.functions system kernel ;
-
-! a bit racy but I can't think of a better way to check this right now
-[ t ]
-[ millis 1000 / micros 1000000 / [ truncate ] bi@ = ] unit-test
-

extra/micros/micros.factor

@@ -1,13 +0,0 @@
-IN: micros
-USING: micros.backend system kernel combinators vocabs.loader math ;
-
-: micros ( -- n ) (micros) ; inline
-
-: micro-time ( quot -- n )
-  micros slip micros swap - ; inline
-
-{
-    { [ os unix? ] [ "micros.unix" ] }
-    { [ os windows? ] [ "micros.windows" ] }
-} cond require
-

extra/micros/summary.txt

@@ -1 +0,0 @@
-Microsecond precision clock

extra/micros/unix/tags.txt

@@ -1 +0,0 @@
-unportable

extra/micros/unix/unix.factor

@@ -1,6 +0,0 @@
-IN: micros.unix
-USING: micros.backend io.backend system alien.c-types kernel unix.time math ;
-
-M: unix (micros)
-  "timespec" <c-object> dup f gettimeofday drop
-  [ timespec-sec 1000000 * ] [ timespec-nsec ] bi + ;

extra/micros/windows/tags.txt

@@ -1 +0,0 @@
-unportable

extra/micros/windows/windows.factor

@@ -1,7 +0,0 @@
-IN: micros.windows
-USING: system kernel windows.time math math.functions micros.backend ;
-
-! 116444736000000000 is the windowstime epoch offset
-! since windowstime starts at 1600 and unix epoch is 1970
-M: windows (micros)
-  windows-time 116444736000000000 - 10 / truncate ;