Add new Feature: Sankey diagrams for exergy flow plotting

[fwitte]

This PR adds a data generator for the plotly library to use sankey diagrams.

An automatically generated diagram could look like this:

To finish up:

• [ ] Add test for prohibited fkt_group labels
• [ ] Add test with large power plant
• [ ] Add tests for each of the exergy balances in the components
• [ ] Add a documentation section for analyses module
• [ ] Update What's New

[pep8speaks]

Hello @fwitte! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file src/tespy/tools/analyses.py:

Line 318:80: E501 line too long (97 > 79 characters) Line 427:80: E501 line too long (80 > 79 characters) Line 448:80: E501 line too long (80 > 79 characters)

Comment last updated at 2021-04-29 07:38:47 UTC

[lgtm-com[bot]]

This pull request introduces 1 alert when merging a976c1b939912454b8a34d662c95eaca340c2c4f into d032adccb81367ebc995be0a1adabf987fd6308a - view on LGTM.com

new alerts:

• 1 for Unused import

[fwitte]

To finish up:

• [ ] Add test for prohibited fkt_group labels
• [ ] Add test with large power plant
• [ ] Add tests for each of the exergy balances in the components
• [ ] Add a documentation section in the TESPy modules overview
• [ ] Update What's New

[lgtm-com[bot]]

This pull request introduces 3 alerts when merging 849ff5057619e679437582afdfd0a23b01ebee60 into fd54570748827808b38866c402739ff7620a0b30 - view on LGTM.com

new alerts:

• 3 for Unused import

[lgtm-com[bot]]

This pull request introduces 3 alerts when merging fe575e4b72315d081e96b776f1fc7a37895a7467 into fd54570748827808b38866c402739ff7620a0b30 - view on LGTM.com

new alerts:

• 3 for Unused import