REPL in a clean folder without RASCAL.MF looks for sources in `./src` instead of `.`

[jurgenvinju]

I'm in ~/git and:

17:46:32 git$ java -jar rascal/target/rascal-0.42.0-RC4-SNAPSHOT.jar 
[INFO] pom.xml: Rascal version is 0.42.0-RC4-SNAPSHOT
[INFO] pom.xml: Project root is |file:///Users/jurgenv/git/|
[INFO] pom.xml: Bin folder   is |file:///Users/jurgenv/git/target/classes|
[INFO] pom.xml: Source module path is:
  - |std:///|
  - |file:///Users/jurgenv/git/src|
[INFO] pom.xml: Library module (and classes) path is:
  - |file:///Users/jurgenv/git/rascal/target/rascal-0.42.0-RC4-SNAPSHOT.jar|

• |file:///Users/jurgenv/git/src| should be |file:///Users/jurgenv/git/| right?
• we don't have tests for these kinds of regressions, and not even documentation that it should behave this way.

[DavyLandman]

In general the behavior of the repl outside an proper rascal project is undocumented. The VS Code IDE even warns about this.

Like we need a pom.xml and we need a rascal.mf to figure our what's up.