Entropy: move entropy.conf parsing into SystemSettings Singleton

class.

As announced, SystemSettings is going to host all the Entropy
global variables. With this big commit, proxy config (and the rest
of entropy.conf data) has been moved under SystemSettings['system']

client/equo.py

@@ -30,6 +30,8 @@ from entropy.exceptions import *
 from entropy.const import *
 from entropy.output import *
 import entropy.tools as entropyTools
+from entropy.core import SystemSettings
+SysSettings = SystemSettings()
 try:
     from entropy.i18n import _
 except ImportError:
@@ -63,7 +65,7 @@ etpExitMessages = {
 
 myopts = [
     None,
-    (0," ~ "+etpConst['systemname']+" ~ ",1,'Entropy Package Manager - (C) %s' % (entropyTools.get_year(),) ),
+    (0," ~ %s ~ " % (SysSettings['system']['name'],) ,1,'Entropy Package Manager - (C) %s' % (entropyTools.get_year(),) ),
     None,
     (0,_('Basic Options'),0,None),
     None,