largefiles: fix 'hg clone . ../foo' OSError abort
Operating on a non-existant file can cause both IOError and OSError,
depending on the function used: open raises IOError, os.lstat raises
OSError.
The largefiles code called dirstate.normal, which in turn calls
os.lstat, so OSError is the right exception to catch here.
tests: test-patchbomb.t cleanup
Let commit messages and file names describe the facts without making incorrect
guess of the actual handling of it.
tests: show actual output in test-patchbomb.t
Drop fixheader and decode base64 encoded content and show non-ascii content.
tests: test findexe() access check fixed in
58f96703a9ab
check-code: fix return code initialization
Don't crash when nothing is tested, but return failure when other files than
the last one fails.
tests: make test-commandserver.py independent of line ending and slash direction