Rewrite Makefile -> Maven POM

[shipilev]

This makes the following:

• Moves org files under src/main/java (Maven convention)
• Moves the actually compiling cpp file to src/main/cpp (not a convention, but a symmetry with java
• Hooks up (semi-)standard plugins to appropriate lifecycle steps
• Updates README

Things left to do:

• Figure out if src/main/java/org/checkpoint/CheckpointRestore.{hpp|cpp} are needed. If so, move them to src/main/cpp
• Disable the build on non-Linux platforms
• Remove Makefile and update README with full instructions
• Maybe move the JavaCriuJar down one level, so users do no have to do additional cd

End result is:

$ mvn clean verify
$ jar tf target/checkpoint.jar
META-INF/
META-INF/MANIFEST.MF
libCheckpointRestore.so
org/
org/checkpoint/
org/checkpoint/Hook.class
org/checkpoint/CheckpointRestore.class
META-INF/maven/
META-INF/maven/org.openjdk.criu/
META-INF/maven/org.openjdk.criu/criu-jar/
META-INF/maven/org.openjdk.criu/criu-jar/pom.xml
META-INF/maven/org.openjdk.criu/criu-jar/pom.properties

[mbien]

i was about to do the same but you beat me to it :)

org_checkpoint_CheckpointRestore seems to be the most recent version, looks like CheckpointRestore.{hpp|cpp} are older duplicates.

[mbien]

added draft PR #2 which builds on top of this PR