cmfm: don't allow load files bigger than available memory

Change-Id: I6b1bc0d1aecfac2c6f1948b63eb0a51921c0497b
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
cmfm: make icons to be displayed at the same size in AssociationsDialog

Change-Id: Iddb81a1af7857af117946669134c2d87ec33993c
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>