[chronojump/chronojump-importer] Hides "Import session from another Chronojump" if not in "Jumps" mode.

[Carles Pina i Estany <carlespina src gnome org>]

commit e8c7e9e2eeb619dc60a109c1803fecc7b01f68eb
Author: Carles Pina i Estany <carles pina cat>
Date:   Sun Sep 25 19:13:54 2016 +0200

    Hides "Import session from another Chronojump" if not in "Jumps" mode.
    
    "Runs" and "Power" importing sessions is not implemented yet.

 src/gui/chronojump.cs |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/gui/chronojump.cs b/src/gui/chronojump.cs
index 59d7375..f53726e 100644
--- a/src/gui/chronojump.cs
+++ b/src/gui/chronojump.cs
@@ -183,6 +183,7 @@ public partial class ChronoJumpWindow
        [Widget] Gtk.MenuItem menuitem_export_csv;
        [Widget] Gtk.MenuItem menuitem_export_xml;
        [Widget] Gtk.MenuItem menuitem_encoder_session_overview;
+       [Widget] Gtk.MenuItem menuitem_import_chronojump_session;
        [Widget] Gtk.Image image_session_open;
                
        //menu person
@@ -2934,6 +2935,7 @@ public partial class ChronoJumpWindow
                menuitem_encoder_session_overview.Visible = false;
                menuitem_export_encoder_signal.Visible = false;
                menuitem_export_csv.Visible = true;
+               menuitem_import_chronojump_session.Visible = true;
 
                hbox_other.Visible = false;
 
@@ -2961,6 +2963,9 @@ public partial class ChronoJumpWindow
                {
                        notebook_sup.CurrentPage = 0;
                        notebook_capture_analyze.ShowTabs = true;
+
+                       menuitem_import_chronojump_session.Visible = false;     // not implemented yet
+
                        if(m == Constants.Menuitem_modes.RUNSSIMPLE) 
                        {
                                menuitem_mode_selected_runs_simple.Visible = true;
@@ -2982,6 +2987,8 @@ public partial class ChronoJumpWindow
                        menuitem_encoder_session_overview.Visible = true;
                        menuitem_export_encoder_signal.Visible = true;
                        menuitem_export_csv.Visible = false;
+
+                       menuitem_import_chronojump_session.Visible = false;     // not implemented yet
                        
                        //on OSX R is not installed by default. Check if it's installed. Needed for encoder
                        if( UtilAll.GetOSEnum() == UtilAll.OperatingSystems.MACOSX &&
@@ -6564,6 +6571,7 @@ LogB.Debug("X");
                menuitem_export_csv.Sensitive = option;
                //menuitem_export_xml.Sensitive = option; not implemented yet
                menuitem_encoder_session_overview.Sensitive = option;
+
        }
        
        private void menuPersonSelectedSensitive(bool option)