Add timeout for downloading tiles

[Jekus]

I find it can block for hours because of some network problems. Although it's not a common situation , I think it's a good idea to add a timeout for downloading each tile. If you don't set a timeout , it may affect the next execution of the script , depending on the scheduler you are using.

[boramalper]

I think adding timeout is a good idea, though I think we can calculate the timeout automatically:

• Instead of a times and timeout, we can add another variable deadline to indicate in how many himawaripy should be done.
  • Because using your defaults (times = 3 and timeout = 120) in the worst case himawaripy can run for a day using a single on a single core machine. :) ((((4 ** 2) * 3 * 120 / 60) / 24) / 4)
• So the timeout will be DEADLINE * 60 / (LEVEL ** 2) seconds for each tile to be downloaded.

[boramalper]

@Jekus Thank you!