Pyftpsync

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- Add SFTP support
- Improve `run` command
- New `tree` command
- New `--case` argument for better handling of ambigous files that only differ
in the name's casing
- New `--create-folder` argument to allow creation of missing remote folders
- New `--report-problems` argument to return exit code 10 on skipped files
like unresolved conflicts or copy errors
- New `--no-dry-run` argument to `run` command to override a default dry_run
configuration (alias: `--execute`)
- New `--debug classify` argument helps with analysis of synchronization problems
- `--migrate` now always removes outdated metadata files (before, this was only
done when a file inside that directory was touched)
- Copy errors (e.g. due to encoding problems) are skipped (see also `--report-problems`)
- Fix 26: Crash when not setting verbose option
- Use [Yabs](https://github.com/mar10/yabs) as release tool
- **Breaking Changes:**
- Drop support for Python 2.x (end-of-life: 2020-01-01)
- Rename `.pyftpsync.yaml` to `pyftpsync.yaml`
- Rename FtpTarget => FTPTarget

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See branch `maintain_3.x`.

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- Drop support for Python 3.4 (end-of-life: 2019-03-18)
- Add support for Python 3.8
- Fix 38 Remove trailing '/' before checking PWD response

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- This release addresses some known **encoding-related issues**:

- The internal path format are now native strings (i.e. unicode on Python 3
or UTF-8 bytes on Python 2)
- FTP targets are now assumed to support UTF-8.
- 30: Fallback to CP-1252 encoding when FTP server returns non-UTF-8
- Local filesystem targets now consider the OS encoding.
- Modified format of `.pyftpsync-meta.json`: File names are now stored as UTF-8
(was the unmodified binary format of the target platform before).
- See also the 'encoding' section in the
[spec](https://github.com/mar10/pyftpsync/blob/master/docs/sphinx/pyftpsync-spec.pdf).

- **New `run` command** reads and executes settings from a configuration file
`.pyftpsync.yaml`
- Remove trailing garbage from output lines

**Breaking Changes:**
- Modified format of `.pyftpsync-meta.json`.
Pass `--migrate` option to convert from a prvious version (note that this
cannot be undone)

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- Allow `-v` with `--version` option.
- Fix 26: Crash when not setting verbose option.
- Print SYST and FEAT when -vv is passed
- Accept list type options for `exclude` argument in CLI mode
- Apply and enforce Black formatter
- Fix 27: Download- and UploadSynchronizer honor `--delete` flag for all
conditions.<br>
**NOTE:** default settings will no longer delete files for up- and downloads.

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**Note**: the command line options have changed:
**Be careful with existing shell scripts after updating from v1.x!**

**New Features:**
- New `scan` command to list, purge, etc. remote targets.
- Add FTPS (TLS) support.
- Support Active FTP.
- Support for `.netrc` files.
- CLI returns defined error codes.
- Use configurable logger for output when not in CLI mode.
- Release as Wheel.

**Breaking Changes:**

- Write mode is now on by default.
The `-x`, `--execute` option was removed, use `--dry-run` instead.
- `-f`, `--include-files` option was renamed to `-m`, `--match`.<br>
`-o`, `--omit` option was renamed to `-x`, `--exclude`.
- Modified format of `.pyftpsync-meta.json`.
- Dropped support for Python 2.6 and 3.3.

**Fixes and Improvements:**
- Remove lock file on Ctrl-C.
- Refactored and split into more modules.
- Improved test framework and documentation.
- Enforce PEP8, use flake8.