Simple formatting of time variables

I've added simple formatting of time time variables (for ``%a``, ``%s``, ``%S``) in strftime ``%H:%M:%S`` format. Change itself is 3 lines, for 3 variables, format is hard-coded inline. I just wanted to see value of these variables. I think ``%H:%M:%S`` works reasonably well and don't have to be configurable (well at least for now it's not, yet it does the job). Since I was editing ``weather.c`` I've removed all extraneous spaces (same can be done with ``shaman.c``). I've edited also ``docs`` to include format there. Probably whole thing can be improved in various ways, yet this seems to me as reasonable output format / handling for start.

If this fits the bill, consider merging. Thanks for shaman! ;)