Changes:
- CreateFieldDialog Class: add fields, a bug.
- Create a ShowFieldsDialog Class, a bug.
- Validate some MainWindows menus
Merge branch 'master' of https://github.com/Henry23/RecordsManagementSystem.git

Conflicts:
	RecordsManagementSystem/RecordsManagementSystem.pro.user
	RecordsManagementSystem/classes/recordsfile.cpp
	RecordsManagementSystem/mainwindow.cpp