Changed some table names, added DMLManager, created abstract Entity clas
  - Changed classnames of mapped classes to xxxEntity.java
    because of better understanding
  - created the Class DMLManager
    it executes basic DML operations for Entities so there is no need
    for opening Sessions and Transactions 100 times and copy paste code
    fragments
  - created abstract Entity class
    which defines that an entity has to implement basic functions:
       insert, update, delete, lookup
  - cleaned code a little bit (I'll never write messy code again...)
	modified:   build/classes/LanguageMapping.hbm.xml
	modified:   build/classes/LessonMapping.hbm.xml
	modified:   build/classes/LessonVocabMapping.xml
	modified:   build/classes/SessionMapping.xml
	modified:   build/classes/StudycardMapping.hbm.xml
	modified:   build/classes/TranslationMapping.hbm.xml
	modified:   build/classes/VgroupMapping.hbm.xml
	modified:   build/classes/VocabAdvancedMapping.hbm.xml
	modified:   build/classes/VocabGroupMapping.hbm.xml
	modified:   build/classes/VocabMapping.hbm.xml
	modified:   build/classes/VocabTranslationsMapping.hbm.xml
	modified:   db/qtdatabase.h2.db
	new file:   db/qtdatabase.lock.db
	modified:   db/qtdatabase.trace.db
	modified:   nbproject/private/private.xml
	modified:   src/LanguageMapping.hbm.xml
	modified:   src/LessonMapping.hbm.xml
	modified:   src/LessonVocabMapping.xml
	modified:   src/SessionMapping.xml
	modified:   src/StudycardMapping.hbm.xml
	modified:   src/TranslationMapping.hbm.xml
	modified:   src/VgroupMapping.hbm.xml
	modified:   src/VocabAdvancedMapping.hbm.xml
	modified:   src/VocabGroupMapping.hbm.xml
	modified:   src/VocabMapping.hbm.xml
	modified:   src/VocabTranslationsMapping.hbm.xml
	deleted:    src/database/tables/GroupVocab.java
	new file:   src/database/tables/GroupVocabEntity.java
	deleted:    src/database/tables/Language.java
	new file:   src/database/tables/LanguageEntity.java
	deleted:    src/database/tables/Lesson.java
	new file:   src/database/tables/LessonEntity.java
	deleted:    src/database/tables/LessonVocab.java
	new file:   src/database/tables/LessonVocabEntity.java
	deleted:    src/database/tables/Session.java
	new file:   src/database/tables/SessionEntity.java
	deleted:    src/database/tables/Studycard.java
	new file:   src/database/tables/StudycardEntity.java
	deleted:    src/database/tables/StudycardSession.java
	new file:   src/database/tables/StudycardSessionEntity.java
	renamed:    src/database/tables/Translation.java -> src/database/tables/TranslationEntity.java
	deleted:    src/database/tables/Url.java
	new file:   src/database/tables/UrlEntity.java
	deleted:    src/database/tables/Vgroup.java
	new file:   src/database/tables/VgroupEntity.java
	renamed:    src/database/tables/VocabAdvanced.java -> src/database/tables/VocabAdvancedEntity.java
	renamed:    src/database/tables/Vocab.java -> src/database/tables/VocabEntity.java
	modified:   src/database/tables/VocabTranslationsEntity.java
	modified:   src/main/Main.java
	renamed:    src/modules/QAddVocab.java -> src/modules/addvocab/QAddVocab.java
	renamed:    src/modules/QEditVocab.java -> src/modules/editvocab/QEditVocab.java
	modified:   src/modules/lesson/QLessonManagerModule.java
	renamed:    src/modules/QLessonManager.java -> src/modules/lessonmodule/QLessonManager.java
	modified:   src/modules/lookup/QLookup.java
	modified:   src/modules/studycard/QStudycardModule.java
	modified:   src/modules/studycard/StudycardCard.java
	modified:   src/modules/studycard/StudycardSide.java
	modified:   src/modules/vocab/QAddVocabModule.java
	new file:   src/utils/database/DMLManager.java
	new file:   src/utils/database/Entity.java