Update MultiFileHashMap.java

v2.0 (The last version i guess)
junit
Revert "junit"

This reverts commit 214851de08371aecc3b50ee60c4b20301ccc9d21.
Revert "Revert "junit""

This reverts commit 4a83bad0035b422ca3bac79f1b7a311ba27e5b86.
Delete FileMap.java
Create FileMap.java
Delete MainClass.java
Delete DbMain.java
V 1.1

The first attempt to repair merger conflict.
V 1.1

Remove outdated fiels
V 1.1.2

Chekstyle
V 1.2

Added tests, put all the folders in the JUnit., fixed the errors.
Revert "V 1.2"

This reverts commit a15ce6b950f845cdb3a53b465af07c8d465d212a.
Create Main.java
Create Main.java
Delete

Perezaliv
V 1.2

Recommit
V 1.2.1

Delete wrong files
v 1.2.2
Update FileMap.java

Checkstyle