Added tests with removing files and changing packages.

jps-plugin/testData/incremental/multiplePackagesModified/a1.kt

@@ -0,0 +1,3 @@
+package a
+
+fun a1() = ":)"

jps-plugin/testData/incremental/multiplePackagesModified/a2.kt.new

@@ -0,0 +1,3 @@
+package a
+
+fun a2() = ":))"

jps-plugin/testData/incremental/multiplePackagesModified/b1.kt

@@ -0,0 +1,3 @@
+package b
+
+fun b1() = ":("

jps-plugin/testData/incremental/multiplePackagesModified/b2.kt

@@ -0,0 +1,3 @@
+package b
+
+fun b2() = ":(("

jps-plugin/testData/incremental/multiplePackagesModified/build.log

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+Cleaning output files:
+out/production/module/b/BPackage-b2-*.class
+out/production/module/b/BPackage.class
+End of files
+Compiling files:
+src/a2.kt
+End of files
+Cleaning output files:
+out/production/module/a/APackage-a1-*.class
+out/production/module/a/APackage.class
+out/production/module/b/BPackage-b1-*.class
+out/production/module/b/BPackage.class
+End of files
+Compiling files:
+src/a1.kt
+src/b1.kt
+End of files