[CORE] fix maskLevel is set with group id while it should be group level

See #144
[iourt42] updated Radio call regex: allow to parse log lines with missing radio location
Merge pull request #161 from FenixXx/release-1.10

[iourt42] updated Radio call regular expression
Merge pull request #150 from thomasleveil/fix/group_level_in_mask_level

fix maskLevel is set with group id while it should be group level
add json output
reformat code to be closer to PEP 8
Merge pull request #160 from ozon/features/help-json_output

[core] add json output for autodoc
[STORAGE] refactored syntax: get close to PEP8
[STORAGE] fixed impossibility to retrieve group 'guest' from the storage layer
[TESTS] update tests to comply with the new getGroup() storage method
Merge pull request #163 from FenixXx/release-1.10

[STORAGE] fix impossibility to retrieve group 'guest' from the storage layer