Use a way stronger compression

The deflate compression is the algorithm used for zip archives.
It is loss less and features some more tweaking options in order
to get smaller results.

With the usage of quite heavy compression options, we can reduce
the usual amount of memory of shakemap geotiff files to need only
around 60% of the original size using the lzw algorithm.

Of cause, read and write times will increase. But as the size of
a single shakemap is relativly small (our problem with the size is
the pure amount that we have for the earthquake explorer), it should
not be totally bad to work with those files later.
3 jobs for master in 13 minutes and 47 seconds (queued for 9 seconds)
Status Name Job ID Coverage
  Test
passed coverage #86924

00:04:58

failed formatting #86922

00:07:05

passed test #86923

00:08:46

 
Name Stage Failure
failed
formatting Test
- exit code: 1

shakyground2/shakemap.py:376:97: E501 line too long (99 > 96 characters)
shakyground2/shakemap.py:377:97: E501 line too long (98 > 96 characters)
shakyground2/shakemap.py:380:97: E501 line too long (102 > 96 characters)

pylint...................................................................Passed
Cleaning up file based variables
ERROR: Job failed: exit code 1