Remove fling, deftserver (used only by fling), and commons-codec

Remove fling, deftserver (used only by fling), and commons-codec
(used only by dartboard).

(I'll submit a change to the top-level LICENSE file once this goes in)
Committed: https://code.google.com/p/dart/source/detail?r=3854

[zundel, 2012-02-02 17:36:47]

After applying the patch, here are some things I found:

.gitignore has a reference to fling

client/dart.gyp has a reference to fling
dart.gyp  has a reference (in comments)

/frog/leg/scanner/source_list.dart has some references to to files in the fling
directory for some reason.

./samples/total/client/Server.dart  has one I forgot to remove

The belay sample still has a lot of references.

I have a file named client/client/fling.target.mk in my client, but I think it
is a transient gyp artifact

I don't think this is anything to worry about, but I had problems patching in
the deletion of third_party/commons-codec

patching file third_party/commons-codec/1.5/LICENSE.txt
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file
third_party/commons-codec/1.5/LICENSE.txt.rej
patching file third_party/commons-codec/1.5/NOTICE.txt
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file
third_party/commons-codec/1.5/NOTICE.txt.rej
patching file third_party/commons-codec/1.5/RELEASE-NOTES.txt
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file
third_party/commons-codec/1.5/RELEASE-NOTES.txt.rej

[zundel, 2012-02-02 18:03:15]

LGTM,

fyi, the samples/total/Server.dart file can be completely removed.