Dewi-utils

- add lock module for simple locking
- udate rrdtool to run partially
- add files module to find recursively like searching for .gitignore
- add screen module - currently adding frame of '' chars around text
- add config module for managing gitconfig-like ini files
(like remote.master.merge: [remote "master"]\nmerge...)
- add ConfigPage for interactive config management

- readd rrdtool into dewi_utils.rrdtool

- !!! DEWI goes into multiple repositories and packages
- add ``csv`` module to load simple CSV files
- keep dewi.utils package as dewi_utils
- start using semantic versioning

- MainApplication: --debug implies --log-level debug
default log level: info
- images/filedb: add count() to count entries in photo_file_info table
- images related commands: use exiftool-5.26 as MacPorts updated it
- safe_delete_images: handle Exceptions at unlink(), mainly PermissionErrors
- add further log_*() calls into dewi.rrdtool & realtime_sync

- pretty-print output command list (e.g. 'list-all')
- add dewi.utils.archive, which contains an UnZip class to (partially) unzip
.zip files
- if a command is mistyped or non-existing, print at most 6 similar command
names, or list all of them
- dewi.images.filedb: add rollback() method to FileDatabase
- dewi.core.context: Context got 'commands' and 'command_registry'
properties, and always contains the corresponding 'commands' and
'commandregistry' fields
- introduce dewi.core.logger module, log_debug, log_info, etc. can be used

- fix setup.py