Graph cdf of probability of selecting among the biggest k exits (#6443)

- Put consensuses and server descriptors into newly created directories
  in/consensuses/ and in/server-descriptors/.

- Put metrics-lib's descriptor.jar, commons-codec, and commons-compress
  into lib/ directory.

- Compile Java class:
  $ javac -d bin -cp lib/descriptor.jar src/CalculatePathSelectionProbabilities.java

- Run Java class:
  $ java -Xmx2g -cp bin:lib/descriptor.jar:lib/commons-codec-1.6.jar:lib/commons-compress-1.4.1.jar CalculatePathSelectionProbabilities

- Plot graphs:
  $ R --slave -f cumulated-weights.R

