Remove dpath version restriction and fix the import

[pnuu]

We've had a version limitation dpath<1.5 as it seemed the .util sub-package didn't exist after that. That was not the case, and everything works if we do import dpath.util. This fixes the imports, and removes the version restriction.

Internally "use satellite projection", which in the product list is marked by using null as area name, now uses 'None' as the newer versions of dpath only support string and integer names.

• [x] Tests passed
• [x] Passes flake8 trollflow2

[pnuu]

Something has changed in either dpath.util.values() or .delete(). Downgrading to 'dpath<1.5' the tests pass locally.

[codecov[bot]]

Codecov Report

Merging #134 (cae3810) into main (ac335a6) will increase coverage by 0.24%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   94.84%   95.08%   +0.24%     
==========================================
  Files          11       11              
  Lines        2268     2280      +12     
==========================================
+ Hits         2151     2168      +17     
+ Misses        117      112       -5     

Flag	Coverage Δ
unittests	95.08% <100.00%> (+0.24%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
trollflow2/dict_tools.py	94.23% <100.00%> (ø)
trollflow2/launcher.py	87.37% <100.00%> (+1.26%)	:arrow_up:
trollflow2/plugins/__init__.py	91.95% <100.00%> (ø)
trollflow2/tests/test_dict_tools.py	91.66% <100.00%> (+3.73%)	:arrow_up:
trollflow2/tests/test_trollflow2.py	99.43% <100.00%> (+<0.01%)	:arrow_up:

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