- related cleanups

R=r
OCL=19227
CL=19227

- implemented elastic tabstops algorithm, now correct and documented
- first cut at printing comments (use -comments flag, disabled for now)
- struct field types are now aligned (using elastic tab stops)
- needs more fine-tuning

* fixed a bug in test script
* added quick smoke test to makefile and invoke it in run.bash
  instead of the full test

R=r
OCL=19220
CL=19220

also add code to print (pointers to) arrays, through %v.

R=rsc
DELTA=108  (70 added, 33 deleted, 5 changed)
OCL=19184
CL=19192

R=r
OCL=19172
CL=19172

	if an object in an archive tries to refer
	to a file in its original source directory,
	ignore it.

* 6ar:
	fix bug if archive is empty.

* gobuild:
	build archive in current directory.

* math:
	use new gobuild Makefile.

* test/math.go:
	rename to mathest.go, add // run line, make it run.

R=r
DELTA=494  (277 added, 203 deleted, 14 changed)
OCL=19090
CL=19171

R=r
OCL=19166
CL=19166

R=r
OCL=19146
CL=19146

R=gri
DELTA=36  (18 added, 18 deleted, 0 changed)
OCL=19059
CL=19133

R=rsc
DELTA=27  (16 added, 11 deleted, 0 changed)
OCL=19130
CL=19132

R=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=19131
CL=19131

R=r
OCL=19107
CL=19109

R=rsc
OCL=19101
CL=19101

R=rsc
DELTA=32  (32 added, 0 deleted, 0 changed)
OCL=19084
CL=19091

- implemented some missing functionality (and, or, xor of positive ints)

R=r
OCL=19087
CL=19087

is recognized by the gccgo testsuite but is ignored by the
errchk script used with 6g.

method1.go:7:1: error: redefinition of 'M': parameter types changed
method1.go:6:1: note: previous definition of 'M' was here
method1.go:10:1: error: redefinition of 'f': parameter types changed
method1.go:9:1: note: previous definition of 'f' was here
method1.go:13:1: error: redefinition of 'g': parameter names changed
method1.go:12:1: note: previous definition of 'g' was here

R=rsc
DELTA=5  (0 added, 0 deleted, 5 changed)
OCL=18962
CL=19058

separate per-function namespace.

R=gri
DELTA=24  (8 added, 16 deleted, 0 changed)
OCL=19006
CL=19057

R=r
OCL=19056
CL=19056

either the buffer is full, zero bytes were read, or an error is returned.

R=rsc
DELTA=44  (42 added, 0 deleted, 2 changed)
OCL=19027
CL=19047

last resort, because it assumes every call is a
real use of the conversion.

R=ken
OCL=19026
CL=19026

* check for uncomputed struct offsets
* distinguish function structs from ordinary structs
* make sure function structs are not examined in isolation

R=ken
OCL=19005
CL=19005

that is generated on Goobuntu.

R=r,rsc
DELTA=2  (1 added, 0 deleted, 1 changed)
OCL=18973
CL=18976

add newline after stack traces.

R=rsc
DELTA=3  (2 added, 1 deleted, 0 changed)
OCL=18945
CL=18953

- new code enabled, but no comments printed yet (so the effect
  of the elastic tabs is not seen yet)

TBR=r
DELTA=200  (93 added, 69 deleted, 38 changed)
OCL=18951
CL=18951

* use union, not cast, to convert between uint64 and float64,
  to avoid possible problems with gcc in future.

R=r
DELTA=75  (39 added, 15 deleted, 21 changed)
OCL=18926
CL=18926

R=gri
DELTA=28  (12 added, 14 deleted, 2 changed)
OCL=18923
CL=18923

R=r
DELTA=48  (23 added, 14 deleted, 11 changed)
OCL=18707
CL=18922

R=rsc
DELTA=12  (9 added, 0 deleted, 3 changed)
OCL=18916
CL=18921

also only time-limit if a value is provided.

R=rsc
DELTA=9  (4 added, 2 deleted, 3 changed)
OCL=18917
CL=18920

R=rsc
DELTA=1075  (1028 added, 31 deleted, 16 changed)
OCL=18865
CL=18918

BUG=1474670
TBR=r
DELTA=6  (6 added, 0 deleted, 0 changed)
OCL=18839
CL=18843

  printing output
- not yet enabled

R=r
OCL=18842
CL=18842

TBR=rsc
OCL=18833
CL=18833

R=r
OCL=18830
CL=18830

R=r
OCL=18807
CL=18807

- language for type guards
- fixed language for break statements

Also: Removed uses of "we" and replaced by impersonal language.
Minor cosmetic changes.

DELTA=237  (160 added, 34 deleted, 43 changed)
OCL=18620
CL=18800

R=r,gri
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=18781
CL=18785

R=r
DELTA=47  (47 added, 0 deleted, 0 changed)
OCL=18581
CL=18748

R=r
OCL=18741
CL=18741

a select clause.

R=ken
DELTA=20  (0 added, 20 deleted, 0 changed)
OCL=18731
CL=18739

R=r
OCL=18738
CL=18738