non-standard libraries and add to build.

R=r
DELTA=211  (210 added, 0 deleted, 1 changed)
OCL=35293
CL=35307

request.go does not handle Content-Type correctly for the definition of
Media Types.

http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.7

R=rsc
APPROVED=rsc
DELTA=44  (42 added, 0 deleted, 2 changed)
OCL=35274
CL=35306

R=r
DELTA=40  (9 added, 3 deleted, 28 changed)
OCL=35277
CL=35305

better mach binaries.
cgo working on darwin+linux amd64+386.
eliminated context switches - pi is 30x faster.
add libcgo to build.

on snow leopard:
  - non-cgo binaries work; all tests pass.
  - cgo binaries work on amd64 but not 386.

R=r
DELTA=2031  (1316 added, 626 deleted, 89 changed)
OCL=35264
CL=35304

R=r
DELTA=3  (0 added, 0 deleted, 3 changed)
OCL=35292
CL=35303

R=iant,rsc,gri
DELTA=106  (87 added, 8 deleted, 11 changed)
OCL=35298
CL=35302

- extra tests

R=rsc
DELTA=366  (264 added, 37 deleted, 65 changed)
OCL=35299
CL=35301

somehow managed not to Put this before.

R=r
DELTA=3  (3 added, 0 deleted, 0 changed)
OCL=35289
CL=35294

R=r
DELTA=894  (887 added, 0 deleted, 7 changed)
OCL=35115
CL=35286

- added extra tests

R=rsc
DELTA=55  (37 added, 0 deleted, 18 changed)
OCL=35250
CL=35276

go/test: passes 74% (251/339)

R=rsc
APPROVED=rsc
DELTA=40  (34 added, 0 deleted, 6 changed)
OCL=35254
CL=35275

R=rsc
APPROVED=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=35208
CL=35261

R=r
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=35242
CL=35258

R=iant
DELTA=13  (1 added, 0 deleted, 12 changed)
OCL=35241
CL=35246

- the first HTML comment in those files is extracted as page
  title when serving them
- lib/godoc.html is top-level template for all pages served
- experimented a bit with package documentation layout
  (feedback welcome)
- various related cleanups

TODO:
- The / page (doc/root.html) content repeats links that are
  in the navigation bar. It needs to be cleaned up.

R=rsc
DELTA=826  (86 added, 692 deleted, 48 changed)
OCL=35230
CL=35245

go/test: passes 71% (242/339)

R=rsc
APPROVED=rsc
DELTA=9  (5 added, 0 deleted, 4 changed)
OCL=35233
CL=35243

still has problems with godefs.

R=rsc
APPROVED=rsc
DELTA=801  (134 added, 235 deleted, 432 changed)
OCL=35189
CL=35211

R=rsc
APPROVED=rsc
DELTA=14  (4 added, 0 deleted, 10 changed)
OCL=35190
CL=35210

(how did that happen?)

go/test: passes 70% (238/339)

R=rsc
APPROVED=rsc
DELTA=18  (10 added, 0 deleted, 8 changed)
OCL=35185
CL=35188

R=r
DELTA=771  (374 added, 287 deleted, 110 changed)
OCL=35187
CL=35187

go/test: passes 69% (237/339)

R=rsc
APPROVED=rsc
DELTA=12  (3 added, 9 deleted, 0 changed)
OCL=35178
CL=35180

R=r
DELTA=70  (47 added, 4 deleted, 19 changed)
OCL=35167
CL=35171

R=rsc
DELTA=684  (324 added, 324 deleted, 36 changed)
OCL=35161
CL=35163

- moved Conversions section out of built-in functions and into expressions
- fixed syntax of conversions (parens are not mandatory if the type is not a TypeName)
  (this is the only change to the Conversions section; the rest of the text is just moved;
  old line: 4043, new line: 3078)
- fixed syntax of composite literals (parens are allowed around LiteralType)

DELTA=239  (115 added, 98 deleted, 26 changed)
OCL=35118
CL=35159

integrated into Makefiles (see misc/cgo/gmp/Makefile).

R=r
DELTA=1110  (540 added, 525 deleted, 45 changed)
OCL=35153
CL=35158

R=r
DELTA=791  (0 added, 791 deleted, 0 changed)
OCL=35154
CL=35154

	void f(struct { int x[1]; } p) { }
the "int" was getting attached to f.

R=ken
OCL=35145
CL=35151

DELTA=136  (120 added, 13 deleted, 3 changed)
OCL=35133
CL=35147

do not print entire buffer on error,
since it can be very large.
instead print identifying string.

R=krasin
DELTA=14  (1 added, 3 deleted, 10 changed)
OCL=35141
CL=35143

R=ken
OCL=35140
CL=35142

R=ken
OCL=35132
CL=35132

R=r
DELTA=236  (211 added, 18 deleted, 7 changed)
OCL=35084
CL=35131

allow parens around [...]int in struct literal.

R=ken
OCL=35112
CL=35130

R=rsc
APPROVED=rsc
DELTA=222  (219 added, 0 deleted, 3 changed)
OCL=35031
CL=35129

APPROVED=rsc
DELTA=190  (190 added, 0 deleted, 0 changed)
OCL=35073
CL=35128

go/test: passes 69% (235/339)

R=rsc
APPROVED=rsc
DELTA=5  (4 added, 1 deleted, 0 changed)
OCL=35107
CL=35109

per discussion with gri.

R=ken
OCL=35108
CL=35108

R=r
DELTA=958  (958 added, 0 deleted, 0 changed)
OCL=35096
CL=35106

R=r
DELTA=471  (471 added, 0 deleted, 0 changed)
OCL=35090
CL=35099

APPROVED=rsc
OCL=34514
CL=35093