Release 1.1.1

This version brings improvements in:

• Added problem type Sat to tdvisu/construct_dpdb_visu.py
• Added testcases in file test/test_dijkstra.py
• JsonAPI.md is now updated with snake_case names and consistent with visualization_data.py
• Fixed default value for svg-join v_top to None from 'top'

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and some small changes including:

• Improved flexibility in several function parameters
• Improved documentation and comments in several places
• Fixed passing parameters to method setup_tree_dec_graph
• Removed old dependency from tdvisu/dijkstra.py on utilities