cmd/gofmt: two dimensional slice/array formatting

[gopherbot]

by mrekucci:

go version go1.3.1 darwin/amd64

Try to format next code snippet: http://play.golang.org/p/b0tIzdvp9i
In my opinion the code should be formatted in a way how it looks like
before formatting i.e. columns aligned to comma.

[ianlancetaylor]

Comment 1:

Labels changed: added repo-main, release-none.

[griesemer]

Comment 2:

Status changed to Thinking.

[cpmech]

Interesting. I reckon formatting by aligning 'equals' is out of scope as well... Example:
myvariable = something
myvar = something else
instead of:
myvariables = something
myvar = something else
that's be awesome