Make source map location information more readable.

Make source map location information more readable.

This changes "file:1:2" to "line 1, column 2 of file" and ":1:2" to
"line 1, column 2" in [SourceFile.getLocationMessage]. The more
machine-readable colon-separated format doesn't make sense for a
message intended for humans.

Since [Location.formatString] seems more likely to be consumed by
machines, its format was left as-is.

This also prepares version 0.9.1 for release.

R=sigmund@google.com

Committed: https://code.google.com/p/dart/source/detail?r=36603

[Siggi Cherem (dart-lang), 2014-05-24 00:37:03]

lgtm

https://codereview.chromium.org/300583002/diff/1/pkg/source_maps/lib/span.dart
File pkg/source_maps/lib/span.dart (right):

https://codereview.chromium.org/300583002/diff/1/pkg/source_maps/lib/span.dar...
pkg/source_maps/lib/span.dart:257: var source = url == null ? '' : ' of
${p.prettyUri(url)}';
does this do anything for package: URIs?

[nweiz, 2014-05-24 00:51:27]

https://codereview.chromium.org/300583002/diff/1/pkg/source_maps/lib/span.dart
File pkg/source_maps/lib/span.dart (right):

https://codereview.chromium.org/300583002/diff/1/pkg/source_maps/lib/span.dar...
pkg/source_maps/lib/span.dart:257: var source = url == null ? '' : ' of
${p.prettyUri(url)}';
On 2014/05/24 00:37:03, Siggi Cherem (dart-lang) wrote:
> does this do anything for package: URIs?

No, they're left as-is.

[nweiz, 2014-05-24 00:52:12]

Committed patchset #1 manually as r36603 (presubmit successful).