Bug 2245 - fixed multiple types of issues

Bug 2245 - fixed multiple types of issues

Issues solved:
1. Objects should be compared with "equals()"
2. Declarations should use Java collection interfaces such as "List" rather than specific implementation classes such as "LinkedList"
3. Modifiers should be declared in correct order
4. Avoid commented-out lines of code
5. Unused private fields should be removed

Change-Id: I4ca2224a9fd272dd2deb25f6f36db2ed7bd8bb99
Signed-off-by: Martin Uhlir <martin.uhlir@pantheon.sk>