fixed awful mistakes
Added standard library implementation
+fixed rollback problem
MultiFileHashMap
Tiny fixes
checkstyle fixes
one more checkstyle fix
Merge pull request #270 from PotapovaSofia/master

Софья Потапова, 396 гр. MultiFileHashMap
Merge pull request #267 from penguin138/master

Nastya Torunova, 396, MultiFileHashMap
new fixes
new fixes
Update DBTable.java
Update DBTable.java
Update DBTable.java
Update DBTableTest.java
Update Main.java
Update TableState.java
Update Main.java
Update Main.java
Update TableState.java
Update MultiMapMain.java