Move logging config to main configuration file.

- Move the content of what was stored in log4rs.yml into the main config
  file, so that there is just one file to parse to get the complete
  configuration.
- Create the global switch `--home` to pass/overload the value for
  SEQUOIA_HOME in the configuration file.

config/config.toml

@@ -5,6 +5,25 @@ connection = "localhost:3000"
 
 sequoia_home = "/tmp/sq_home"
 
-logfile_config = "./config/log4rs.yml"
+#keyservers = [ "hkps://keys.openpgp.org/", "hkps://mail-api.proton.me", "hkps://keys.mailvelope.com", "hkps://keyserver.ubuntu.com", "hkps://sks.pod01.fleetstreetops.com" ]
+keyservers = [ "hkp://example.com" ]
+
+[logging.appenders.console]
+kind = "console"
+[logging.appenders.console.encoder]
+pattern = "{d(%Y-%m-%d %H:%M:%S)(local)} {h({l})} [{t}] {m}{n}"
+
+[logging.appenders.file]
+kind = "file"
+path = "/tmp/husk.log"
+
+[logging.appenders.file.encoder]
+pattern = "{d(%Y-%m-%d %H:%M:%S)(local)} {h({l})} [{t}] {m}{n}"
+
+[logging.root]
+level = "debug"
+appenders = ["file"]
+
+[logging.loggers."husk"]
+level = "debug"
 
-keyservers = [ "hkps://keys.openpgp.org/", "hkps://mail-api.proton.me", "hkps://keys.mailvelope.com", "hkps://keyserver.ubuntu.com", "hkps://sks.pod01.fleetstreetops.com" ]