Support alien cache on hadoop-dfs-fuse which doesn't report file size immediately
Refactor: introduce abort_transaction in test_functions
TEST: add rollback_repo() to test_functions
TEST: return codes of standard repo management
FIX: transaction() fails with non-zero retval
FIX: abort() fails with non-zero retval
FIX: rollback() re-opens repo on failure
python lib can traverse catalogs
Allow pinned non-catalog file to be zero length
Merge pull request #532 from reneme/fix-non_zero_return

FIX: Some cvmfs_server Commands Failed with a Zero-Return Code
changelog
Merge branch 'fix-changelog' into devel
Merge pull request #533 from reneme/feature-python_traverse_catalogs

Feature: Python Library can Traverse Catalogs
Merge pull request #531 from DrDaveD/devel

Support alien cache on hadoop-fuse-dfs which doesn't report size immediately
changelog
Merge branch 'fix-changelog' into devel
New feature: files already in S3 are not reuploaded
timestamp in sync mediator printout
replace asserts by error message print
add Code2Ascii for s3fanout::Failures