consolidate py/code files into code.py, simplify SafeRepr code and docs.

--HG--
branch : trunk

py/code/testing/test_frame.py

@@ -1,27 +1,2 @@
 import sys
 import py
-
-def test_frame_getsourcelineno_myself():
-    def func():
-        return sys._getframe(0)
-    f = func()
-    f = py.code.Frame(f)
-    source, lineno = f.code.fullsource, f.lineno
-    assert source[lineno].startswith("        return sys._getframe(0)")
-
-def test_getstatement_empty_fullsource():
-    def func():
-        return sys._getframe(0)
-    f = func()
-    f = py.code.Frame(f)
-    prop = f.code.__class__.fullsource
-    try:
-        f.code.__class__.fullsource = None
-        assert f.statement == py.code.Source("")
-    finally:
-        f.code.__class__.fullsource = prop
-
-def test_code_from_func(): 
-    co = py.code.Code(test_frame_getsourcelineno_myself) 
-    assert co.firstlineno
-    assert co.path