Issue61: when pssm file does not match pdb files , report error

[LilySnow]

I fixed the following:

1. When pssm file does not match pdb files , report error. Previously, no error is generated.
2. set contact cutoff for pssm-feature to 5.5A. Previously, it used the default cutoff of 8.5A.
3. replaced the 1AK4 pdb files and pssm files in test

[coveralls]

Pull Request Test Coverage Report for Build 404

• 18 of 24 (75.0%) changed or added relevant lines in 1 file are covered.
• 33 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.6%) to 72.914%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
deeprank/features/FullPSSM.py	18	24	75.0%

Files with Coverage Reduction	New Missed Lines	%
deeprank/features/FullPSSM.py	1	76.99%
deeprank/generate/DataGenerator.py	9	56.31%
deeprank/generate/NormalizeData.py	10	87.5%
deeprank/generate/GridTools.py	13	65.52%

Totals
Change from base Build 403:	-0.6%
Covered Lines:	2097
Relevant Lines:	2876

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💛 - Coveralls