Syscall support.
Readdirnames returns array of strings of contents of directory.

R=rsc
DELTA=216  (201 added, 0 deleted, 15 changed)
OCL=24642
CL=24655

R=rsc
DELTA=21  (2 added, 2 deleted, 17 changed)
OCL=24638
CL=24654

R=rsc
DELTA=9  (3 added, 3 deleted, 3 changed)
OCL=24640
CL=24653

R=ken
DELTA=2  (2 added, 0 deleted, 0 changed)
OCL=24643
CL=24643

to pad to size of element rather
than size of array.

R=r
OCL=24641
CL=24641

R=r
OCL=24639
CL=24639

R=rsc
DELTA=30  (0 added, 18 deleted, 12 changed)
OCL=24628
CL=24628

add name to os.FD
clean up some interfaces

R=rsc
DELTA=318  (231 added, 44 deleted, 43 changed)
OCL=24624
CL=24627

R=rsc
DELTA=7  (4 added, 0 deleted, 3 changed)
OCL=24617
CL=24617

- fixed typos, added a reminder for a todo

R=r
DELTA=23  (6 added, 4 deleted, 13 changed)
OCL=24611
CL=24615

R=r
DELTA=14  (14 added, 0 deleted, 0 changed)
OCL=24610
CL=24610

func4.go:8:11: error: invalid operand for unary '&'
func4.go:9:8: error: invalid left hand side of assignment

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=24294
CL=24603

- first stab at a Go Documentation Server (gds)
- various fixes to make initial version of gds work

R=r
OCL=24588
CL=24588

- don't need *struct
- don't need item/rat both
- closures make the inner slaves easier
- delete some old BUG comments

powser2 is left mostly alone, for variety.

R=rsc
DELTA=134  (2 added, 20 deleted, 112 changed)
OCL=24579
CL=24581

R=r
DELTA=10  (7 added, 0 deleted, 3 changed)
OCL=24577
CL=24577

R=gri
DELTA=31  (30 added, 1 deleted, 0 changed)
OCL=24568
CL=24575

R=ken
OCL=24501
CL=24566

R=r
DELTA=257  (250 added, 1 deleted, 6 changed)
OCL=24509
CL=24565

  - moved Object, Type, Scope  out of AST into symboltable
  - moved universe into symboltable
  - removed dead code
- fixed dependency computation (pretty -d filename.go)
- lots of cleanups
- removed tocken channel connection between parser and scanner
  (was cute, but not really needed)

R=r
OCL=24545
CL=24545

R=ken
OCL=24507
CL=24507

- equality of struct types requires equality of field names

DELTA=4  (0 added, 1 deleted, 3 changed)
OCL=24478
CL=24487

R=rsc
DELTA=18  (18 added, 0 deleted, 0 changed)
OCL=24482
CL=24484

make f(g()) work when g returns multiple
args with names different than f expects.

func swap(a, b int) (c, d int) {
	return b, a
}

swap(swap(1,2))

R=ken
OCL=24474
CL=24476

R=r
DELTA=14  (0 added, 13 deleted, 1 changed)
OCL=24458
CL=24470

R=ken
OCL=24455
CL=24455

- more elegant tracing code
- removed some dead code, cleanups

R=r
OCL=24452
CL=24452

is not right if the .6 is only for data and
the init function.

instead of that, pick up everything and
let the dead code/data eliminator throw
away the parts that weren't useful.

R=r
DELTA=25  (0 added, 22 deleted, 3 changed)
OCL=24446
CL=24446

R=ken
OCL=24442
CL=24442

TBR=r
OCL=24439
CL=24439

.* from regexp since it confuses DejaGNU which runs gcc's
testsuite.

R=rsc
DELTA=3  (0 added, 0 deleted, 3 changed)
OCL=24435
CL=24438

- ast statements now use interfaces
- deleted old (now unused) code

R=r
OCL=24422
CL=24422

R=r
OCL=24380
CL=24380

DELTA=46  (25 added, 1 deleted, 20 changed)
OCL=24342
CL=24354

fix a bug in Usage message - would print current value instead of default.

R=rsc
DELTA=53  (7 added, 4 deleted, 42 changed)
OCL=24323
CL=24323

x.go:13: T is not I - missing M()

NOT
x.go:13: T is not I - missing Mfunc()

R=ken
OCL=24316
CL=24316

using interfaces properly => much cleaner code
- converted tracing code to use 'defer' statement
- next steps: convert rest of ast as well

R=r
OCL=24277
CL=24277

R=rsc
DELTA=52  (15 added, 37 deleted, 0 changed)
OCL=24274
CL=24274

TBR=r
OCL=24269
CL=24269

	* heuristic to go farther during stack traces.
	* significantly improved Linux thread handing.

acid:
	* update to new libmach interface.

prof:
	* use new libmach interface.
	* multiple thread support (derived from Rob's copy).
	* first steps toward pprof-like graphs:
	  keep counters indexed by pc,callerpc pairs.

R=r
DELTA=909  (576 added, 123 deleted, 210 changed)
OCL=24240
CL=24259

	* avoid large copies
	* NewBufRead, NewBufWrite never fail
	* add BufReadWrite

io:
	* add io.Close

http, google/net/rpc:
	* add, use http.Conn.Hijack

R=r
DELTA=416  (202 added, 123 deleted, 91 changed)
OCL=24153
CL=24238