core, commons: Remove dead code and TODOs

See #300 and #274

alpha-commons/src/main/java/at/ac/tuwien/kr/alpha/commons/PredicateImpl.java

@@ -24,14 +24,6 @@ class PredicateImpl implements Predicate {
 		this.solverInternal = solverInternal;
 	}
 
-	static PredicateImpl getInstance(String symbol, int arity) {
-		return getInstance(symbol, arity, false, false);
-	}
-
-	static PredicateImpl getInstance(String symbol, int arity, boolean internal) {
-		return getInstance(symbol, arity, internal, false);
-	}
-
 	static PredicateImpl getInstance(String symbol, int arity, boolean internal, boolean solverInternal) {
 		return INTERNER.intern(new PredicateImpl(symbol, arity, internal, solverInternal));
 	}

alpha-commons/src/main/java/at/ac/tuwien/kr/alpha/commons/literals/BasicLiteralImpl.java

@@ -44,7 +44,7 @@
  *
  * Copyright (c) 2017-2018, the Alpha Team.
  */
-class BasicLiteralImpl extends AbstractLiteral implements BasicLiteral { // TODO could we parameterize Literal with Atom type?
+class BasicLiteralImpl extends AbstractLiteral implements BasicLiteral {
 
 	BasicLiteralImpl(BasicAtom atom, boolean positive) {
 		super(atom, positive);

alpha-core/build.gradle.kts

@@ -8,8 +8,8 @@ val antlrVersion = "4.7"
 val stringtemplateVersion = "4.0.8"
 
 dependencies {
-	api(project(":alpha-api")) // TODO does it make more sense to use implementation scope?
-	api(project(":alpha-commons")) // TODO does it make more sense to use implementation scope?
+	api(project(":alpha-api"))
+	api(project(":alpha-commons"))
 
 	// We need to give the ANTLR Plugin a hint.
 	antlr("org.antlr:antlr4:${antlrVersion}")