Upgrade to Neo4j v4.X

[kuzeko]

The current implementation seems to not be compatible with Neo4j V4.x

[kuzeko]

Compile error:

[ERROR] /src/src/main/java/pfiltering/WeightingGraphProcBatched.java:[11,25] cannot access org.neo4j.logging.Log
  bad class file: /root/.m2/repository/org/neo4j/neo4j-logging/4.2.0/neo4j-logging-4.2.0.jar(org/neo4j/logging/Log.class)
    class file has wrong version 55.0, should be 52.0
    Please remove or make sure it appears in the correct subdirectory of the classpath.
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  01:21 min
[INFO] Finished at: 2021-01-23T11:27:13Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project particlefiltering: Compilation failure
[ERROR] /src/src/main/java/pfiltering/WeightingGraphProcBatched.java:[11,25] cannot access org.neo4j.logging.Log
[ERROR]   bad class file: /root/.m2/repository/org/neo4j/neo4j-logging/4.2.0/neo4j-logging-4.2.0.jar(org/neo4j/logging/Log.class)
[ERROR]     class file has wrong version 55.0, should be 52.0
[ERROR]     Please remove or make sure it appears in the correct subdirectory of the classpath.

Steps to reproduce:

docker run -v $(pwd):/src  -it --rm --entrypoint /bin/bash maven:3.6-jdk-8-alpine
cd /src
mvn package

[kuzeko]

Compiled 7a90b99 succesfully!

with

docker run -v $(pwd):/src  -it --rm --entrypoint /bin/bash maven:3.6.3-jdk-11

[kuzeko]

@DenisGallo It works.
Tested with Neo4j 4.1.2
We can merge in master and prepare a package realease (the jar file)