Polished exception handling when importing extensions:
- Warning about failed import is printed on one line.
- For this warning the [extensions] section key is used, because the value
doesn't have to be set.
- Whan a --traceback is requested, exit immediately to not mix up problems
when importing an extension with other problems.
adding foo
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
foo
2ed2a3912a0b24502043eae84ee4b279c18b90dd 644 foo
pulling from http://localhost:20059/
searching for changes
no changes found