* ingela/raimo/udp-send-TOS/ERIERL-294/OTP-15747:
  Introduce udp send ancillary data argument down to inet_drv
  Fix old warnings

Document type inet:stat_option() to resolve missing anchor
warnings when this type is referenced in other applications.

Change-Id: Ifbf775c2f67b48bcf7d0cf21c39065d3dacc4f55

* siri/logger/file-logging-improvements:
  [logger] Add option file_check to logger_std_h
  [logger] Add log file rotation by options to logger_std_h
  [logger] Add better control of file modes in logger_std_h
  [logger] Refactor logger_std_h
  [logger] Make sure log file is re-opened with configured file options

OTP-15663

This option indicates how often the handler shall check if the log
file still exists and if the inode is changed.

OTP-15479
OTP-15662

New configuration map for logger_std_h:

 #{type => file,
   file => file:filename(),
   modes => [file:mode()],
   max_no_bytes => pos_integer() | infinity,
   max_no_files => non_neg_integer(),
   compress_on_rotate => boolean()}

For backwards compatibility, the old variant for specifying the file
name via the 'type' parameter is still supported, i.e. {file,FileName}
and {file,FileName,Modes}, but it is no longer documented.

Rotation scheme:
The current log file always has the same name, and the archived files
get extensions ".0", ".1", ... The newest archive has extension ".0",
and the oldest archive has the highest number.

If 'compress_on_rotate' is set to true, the archived files are gzipped
and get the additional extension ".gz", e.g. error.log.0.gz.

Rotation is turned off by setting 'max_no_bytes' to infinity. Setting
'max_no_files' to 0 does not turn off rotation, but only specifies
that no archives are to be saved.