provide the PADDS algorithm for spotpy

[coveralls]

Pull Request Test Coverage Report for Build 687

• 289 of 318 (90.88%) changed or added relevant lines in 8 files are covered.
• 11 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.2%) to 91.254%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
spotpy/unittests/test_padds.py	46	51	90.2%
spotpy/algorithms/_algorithm.py	36	42	85.71%
spotpy/algorithms/padds.py	198	216	91.67%
<!--	Total:	289	318	90.88%	-->

Files with Coverage Reduction	New Missed Lines	%
spotpy/algorithms/_algorithm.py	1	86.41%
spotpy/unittests/test_algorithms.py	4	93.62%
spotpy/algorithms/dream.py	6	89.22%
<!--	Total:	11		-->

Totals
Change from base Build 685:	-0.2%
Covered Lines:	5718
Relevant Lines:	6266

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 695

• 300 of 329 (91.19%) changed or added relevant lines in 9 files are covered.
• 13 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.002%) to 91.475%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
spotpy/unittests/test_padds.py	46	51	90.2%
spotpy/algorithms/_algorithm.py	36	42	85.71%
spotpy/algorithms/padds.py	198	216	91.67%
<!--	Total:	300	329	91.19%	-->

Files with Coverage Reduction	New Missed Lines	%
spotpy/algorithms/_algorithm.py	1	86.41%
spotpy/algorithms/demcz.py	2	92.74%
spotpy/unittests/test_algorithms.py	4	96.15%
spotpy/algorithms/dream.py	6	93.14%
<!--	Total:	13		-->

Totals
Change from base Build 685:	-0.002%
Covered Lines:	5741
Relevant Lines:	6276

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💛 - Coveralls