that are not away from some other X secs.

and results away

trac: finishes #26937

**Important changes**:

- `cleanup/stale_days` is renamed to `cleanup/data_files_compress_after_days`
- `cleanup/rotten_days` is renamed to `cleanup/data_files_delete_after_days`
- sbws now takes as an argument the path to a config file (which contains
 `sbws_home`) instead of `sbws_home` (which contains the path to a config
file)

See the changelog for more information

and other features to make sbws more compatible with system
packages.

teor authored Jul 18, 2018 and juga committed Jul 23, 2018

Also:
* document the location of latest.v3bw
* document the atomic creation of latest.v3bw
* explain how to atomically create latest.v3bw when transferring it to
  another host

Closes tor trac 26740.

- Remove started_at file in config et al.
- Add state_fname to config et al.
- Remove read/write functions for the started_at file in scanner.py
  and genearte.py

**Important changes**:

- The way users configure logging has changed. No longer are most users
  expected to be familiar with how to configure python's standard logging
library with a config file. Instead we've abstracted out the setting of log
level, format, and destinations to make these settings more accessible to
users. Expert users familiar with [the logging config file format][logconffmt]
can still make tweaks.

Summary of changes:

- Make logging configuration easier for the user.
- Add UML diagrams to documentation. They can be found in docs/source/images/
  and regenerated with `make umlsvg` in docs/.

[logconffmt]: https://docs.python.org/3/library/logging.config.html#logging-config-fileformat