plugin blog import dotclear: use a smaller and lower case prefix to generate ids

src/plugins/plugin_blog_import_dotclear.py

@@ -52,7 +52,7 @@ Depending on your configuration, your may need to use Import/Export plugin and e
 
 location: you must use the absolute path to your backup for the location parameter
 """)
-POST_ID_PREFIX = u"SàT_DOTCLEAR_IMPORT_BLOG"
+POST_ID_PREFIX = u"sat_dc_"
 KNOWN_DATA_TYPES = ('link', 'setting', 'post', 'meta', 'media', 'post_media', 'comment', 'captcha')
 ESCAPE_MAP = {
     'r': u'\r',