core: fixed Params class name in load_default_params

INSTALL

@@ -17,6 +17,7 @@ To use SàT, you will need to install:
 - wxWidgets (http://www.wxwidgets.org) which is found in most distributions. The more recent the version is, the better.
 - urwid (http://excess.org/urwid/) which can be installed with easy_install
 - BeautifulSoup (http://www.crummy.com/software/BeautifulSoup/) which can be installed with easy_install
+- Mutagen (http://code.google.com/p/mutagen/) which can be installed with easy_install
 
 ** PATHS:
 

src/memory/memory.py

@@ -23,7 +23,6 @@ from __future__ import with_statement
 
 import os.path
 import time
-import cPickle as pickle
 from ConfigParser import SafeConfigParser, NoOptionError, NoSectionError
 from xml.dom import minidom
 from logging import debug, info, warning, error
@@ -74,7 +73,7 @@ class Params():
           }
 
     def load_default_params(self):
-        self.dom = minidom.parseString(Param.default_xml.encode('utf-8'))
+        self.dom = minidom.parseString(Params.default_xml.encode('utf-8'))
 
     def load_xml(self, file):
         """Load parameters template from file"""