migrate to tox

this also requires to move default configuration files to share/ahriman.
Thus the following features have been added
* default configuration is not stored in /usr/share/ahriman/settings
* package installed via PKGBUILD now copies files from /usr
* configuration class now fallbacks to default in /usr

package/share/ahriman/settings/ahriman.ini

@@ -0,0 +1,62 @@
+[settings]
+include = ahriman.ini.d
+logging = ahriman.ini.d/logging.ini
+
+[alpm]
+aur_url = https://aur.archlinux.org
+database = /var/lib/pacman
+repositories = core extra community multilib
+root = /
+
+[auth]
+target = disabled
+max_age = 604800
+oauth_provider = GoogleClient
+oauth_scopes = https://www.googleapis.com/auth/userinfo.email
+safe_build_status = yes
+
+[build]
+archbuild_flags =
+build_command = extra-x86_64-build
+ignore_packages =
+makechrootpkg_flags =
+makepkg_flags =
+
+[repository]
+name = aur-clone
+root = /var/lib/ahriman
+
+[sign]
+target =
+
+[report]
+target = console
+
+[console]
+use_utf = yes
+
+[email]
+full_template_path = /usr/share/ahriman/templates/repo-index.jinja2
+no_empty_report = yes
+template_path = /usr/share/ahriman/templates/email-index.jinja2
+ssl = disabled
+
+[html]
+template_path = /usr/share/ahriman/templates/repo-index.jinja2
+
+[upload]
+target =
+
+[rsync]
+command = rsync --archive --compress --partial --delete
+
+[s3]
+chunk_size = 8388608
+
+[web]
+debug = no
+debug_check_host = no
+debug_allowed_hosts =
+host = 127.0.0.1
+static_path = /usr/share/ahriman/templates/static
+templates = /usr/share/ahriman/templates

package/share/ahriman/settings/ahriman.ini.d/logging.ini

@@ -0,0 +1,74 @@
+[loggers]
+keys = root,build_details,http,stderr,boto3,botocore,nose,s3transfer
+
+[handlers]
+keys = console_handler,syslog_handler
+
+[formatters]
+keys = generic_format,syslog_format
+
+[handler_console_handler]
+class = StreamHandler
+level = DEBUG
+formatter = generic_format
+args = (sys.stderr,)
+
+[handler_syslog_handler]
+class = logging.handlers.SysLogHandler
+level = DEBUG
+formatter = syslog_format
+args = ("/dev/log",)
+
+[formatter_generic_format]
+format = [%(levelname)s %(asctime)s] [%(filename)s:%(lineno)d %(funcName)s]: %(message)s
+datefmt =
+
+[formatter_syslog_format]
+format = [%(levelname)s] [%(name)s] [%(filename)s:%(lineno)d] [%(funcName)s]: %(message)s
+datefmt =
+
+[logger_root]
+level = DEBUG
+handlers = syslog_handler
+qualname = root
+
+[logger_build_details]
+level = DEBUG
+handlers = syslog_handler
+qualname = build_details
+propagate = 0
+
+[logger_http]
+level = DEBUG
+handlers = syslog_handler
+qualname = http
+propagate = 0
+
+[logger_stderr]
+level = DEBUG
+handlers = console_handler
+qualname = stderr
+
+[logger_boto3]
+level = INFO
+handlers = syslog_handler
+qualname = boto3
+propagate = 0
+
+[logger_botocore]
+level = INFO
+handlers = syslog_handler
+qualname = botocore
+propagate = 0
+
+[logger_nose]
+level = INFO
+handlers = syslog_handler
+qualname = nose
+propagate = 0
+
+[logger_s3transfer]
+level = INFO
+handlers = syslog_handler
+qualname = s3transfer
+propagate = 0