gnome-calculator : Replaces '\n' chars by ' ' chars while pasting text in gnome-calculator.

RETURN chars cannot be entered using the keyboard but can be entered using
the copy/paste function. This patch prevents that from happening.

https://bugzilla.gnome.org/show_bug.cgi?id=707061
gnome-calculator : Removes the wrap feature in the display.

The wrap feature allows the display's height to be increased without limit
which causes the calculator window to exit the screen. Disabling this feature
removes such a possibility.

https://bugzilla.gnome.org/show_bug.cgi?id=707061