- Users table model renamed to UsersTableModel- causes linker conflict

with class TableModel in accomodation plugin.
- Edit record dialog is now screen centered.
- Plugin tabs in application main window are now closable.

core/users/tablemodel.cpp

@@ -1,6 +1,6 @@
 #include "tablemodel.h"
 
-TableModel::TableModel(QObject *parent) :AutoTableModel<User>(parent)
+UsersTableModel::UsersTableModel(QObject *parent) :AutoTableModel<User>(parent)
 {
 
 }