Dvc

1) Improve unicode support;
2) Status now returns non-zero code in `-q|--quiet` mode to reflect whether or not the pipeline is up-to-date;
3) Added support for `Content-Md5` as an `ETag` alternative in http(s) remote driver;
4) Unified coding style by using "black" tool;
5) Implemented `-R|--recursive` support for `dvc metrics show`; Kudos tdeboissiere ;
6) `dvc import` now supports `--resume` option to resume downloading if previous download failed;
7) Added support for `credentialpath`(aka `GOOGLE_APPLICATION_CREDENTIALS`) to gs remote driver;
8) `dvc checkout` now suggests `git checkout` just in case user mixed the two and tried to run `dvc checkout <branch>`; Kudos mhham ;
9) Fix bug in `dvc add` that would throw an error if you try to call it twice in a row on the same file;

1) Don't forget to set projectname when connecting to a Google Storage Cloud remote;
2) Use PYTHONPATH when launching analytics worker;
3) Improve `dvc move` help message;

1) Fixed a typo in RemoteBase class;

1) Fix bug in the improper md5 computation for dvc files;

1) Refactored logging subsystem;
2) Improved `dvc init` messages;
3) Supported `remote://` syntax for local remotes;
4) Supported relative paths for local remotes;
5) Introduced `dvc cache` command;
6) `dvc push/pull/etc` are now throwing a warning when stages are not up to date;
7) Refactored deps/outs classes;
8) Supported specifying port in the url for ssh remote;
9) Fixed the bug with improper command escaping on `dvc run`;
10) Refactored remote classes;
11) Supported recursive push/pull/etc;
12) Fixed the bug with improper path resolution when `dvc move` receives a file name with a suffix.
13) Fixed the bug with improper file/directory size cast in our state database;
14) Fixed the bug with improper file size calculation;
15) Refactored `dvc import` error message;
16) Fixed the bug with dvc file not being moved on `dvc move`;
17) Made first iterations to comply with pylint;
18) Introduced another level of the build cache, that will checkout files instead of running the command on `dvc run`, if it detects that this stage has been ran already;
19) Fixed the bug with improper directory path handling in `dvc move`;
20) Fixed the bug with cyclic dependencies in a DAG of a project, as well as introduced additional levels of checks to prevent that from happening;

Fix deb/rpm issue with a missing symlink;