Prepend the year to each glog line (#516)

[aesophor]

This PR fixes issue #516 by prepending the year to each glog line.

Previous format of each line in a log file:
[IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg

New format:
[IWEF]yyyymmdd hh:mm:ss.uuuuuu threadid file:line] msg

This is what a log file will actually look like:

Log file created at: 2020/03/08 23:47:32
Running on machine: adagio
Log line format: [IWEF]yyyymmdd hh:mm:ss.uuuuuu threadid file:line] msg
I20200308 23:47:32.089828 400441 config.cc:27] Loading user configuration: /home/aesophor/.config/wmderland/config
I20200309 07:41:46.769781 400441 config.cc:27] Loading user configuration: /home/aesophor/.config/wmderland/config

[vctang]

Thank you for adding this!!