Enable SQLiteDB backend.

Multiple fixed and finished the implementation of the SQLite backend.
Try to load the database before trying to attempt a rescan.
Delete the metadala list for backends that allocate them on demand.
Moved some generic functions to the databse class.
Renamed utils header to avoid rare QtCreator bug.

qcma.pro

@@ -20,7 +20,7 @@ SOURCES += src/main.cpp \
     src/capability.cpp \
     src/cmaobject.cpp \
     src/cmarootobject.cpp \
-    src/utils.cpp \
+    src/cmautils.cpp \
     src/mainwidget.cpp \
     src/singleapplication.cpp \
     src/sforeader.cpp \
@@ -34,20 +34,20 @@ SOURCES += src/main.cpp \
     src/sqlitedb.cpp \
     src/httpdownloader.cpp \
     src/qlistdb.cpp \
+    src/database.cpp \
 # forms
     src/forms/backupitem.cpp \
     src/forms/backupmanagerform.cpp \
     src/forms/configwidget.cpp \
     src/forms/confirmdialog.cpp \
     src/forms/pinform.cpp \
-    src/forms/progressform.cpp \
-    src/database.cpp
+    src/forms/progressform.cpp
 
 HEADERS += \
     src/capability.h \
     src/cmaobject.h \
     src/cmarootobject.h \
-    src/utils.h \
+    src/cmautils.h \
     src/mainwidget.h \
     src/singleapplication.h \
     src/sforeader.h \
@@ -61,14 +61,14 @@ HEADERS += \
     src/sqlitedb.h \
     src/httpdownloader.h \
     src/qlistdb.h \
+    src/database.h \
 # forms
     src/forms/backupitem.h \
     src/forms/backupmanagerform.h \
     src/forms/configwidget.h \
     src/forms/confirmdialog.h \
     src/forms/pinform.h \
-    src/forms/progressform.h \
-    src/database.h
+    src/forms/progressform.h
 
 FORMS += \
     src/forms/configwidget.ui \