Several cosmetic changes for Debian packaging

[mhatta]

With these, it's mostly sync'd with the current Debian sid package. All of them are harmless and should work for stretch.

[codecov-io]

Codecov Report

Merging #15 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #15      +/-   ##
============================================
+ Coverage      6.35%    6.35%   +<.01%     
+ Complexity     2270     2269       -1     
============================================
  Files          1243     1243              
  Lines        132298   132298              
  Branches      25502    25502              
============================================
+ Hits           8408     8410       +2     
+ Misses       122432   122429       -3     
- Partials       1458     1459       +1

Impacted Files	Coverage Δ	Complexity Δ
core/java/src/net/i2p/kademlia/KBucketSet.java	45.92% <0%> (-0.31%)	44% <0%> (-1%)
core/java/src/net/i2p/crypto/DSAEngine.java	30.97% <0%> (+1.11%)	30% <0%> (ø)	⬇️

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