Do not log decoding of articles by default to reduce logging density

The Debug logs were getting way too confusing with all the "Decoding X" in there, when 99% of the time it is of no importance.

sabnzbd/cfg.py

@@ -261,6 +261,7 @@ fixed_ports = OptionBool('misc', 'fixed_ports', False)
 api_warnings = OptionBool('misc', 'api_warnings', True, protect=True)
 disable_key = OptionBool('misc', 'disable_api_key', False, protect=True)
 no_penalties = OptionBool('misc', 'no_penalties', False)
+debug_log_decoding = OptionBool('misc', 'debug_log_decoding', False)
 
 # Text values
 rss_odd_titles = OptionList('misc', 'rss_odd_titles', ['nzbindex.nl/', 'nzbindex.com/', 'nzbclub.com/'])

sabnzbd/decoder.py

@@ -31,6 +31,7 @@ from sabnzbd.constants import Status, MAX_DECODE_QUEUE, LIMIT_DECODE_QUEUE, SABY
 import sabnzbd.articlecache
 import sabnzbd.downloader
 import sabnzbd.nzbqueue
+import sabnzbd.cfg as cfg
 from sabnzbd.encoding import yenc_name_fixer
 from sabnzbd.misc import match_str
 
@@ -79,6 +80,7 @@ class Decoder(Thread):
 
         self.queue = queue
         self.servers = servers
+        self.__log_decoding = cfg.debug_log_decoding()
 
     def stop(self):
         # Put multiple to stop all decoders
@@ -115,7 +117,9 @@ class Decoder(Thread):
                     if nzo.precheck:
                         raise BadYenc
                     register = True
-                    logging.debug("Decoding %s", art_id)
+
+                    if self.__log_decoding:
+                        logging.debug("Decoding %s", art_id)
 
                     data = self.decode(article, lines, raw_data)
                     nzf.article_count += 1

sabnzbd/interface.py

@@ -1373,7 +1373,7 @@ class ConfigSwitches(object):
 SPECIAL_BOOL_LIST = \
     ('start_paused', 'no_penalties', 'ignore_wrong_unrar', 'overwrite_files', 'enable_par_cleanup',
               'queue_complete_pers', 'api_warnings', 'ampm', 'enable_unrar', 'enable_unzip', 'enable_7zip',
-              'enable_filejoin', 'enable_tsjoin', 'ignore_unrar_dates',
+              'enable_filejoin', 'enable_tsjoin', 'ignore_unrar_dates', 'debug_log_decoding',
               'multipar', 'osx_menu', 'osx_speed', 'win_menu', 'use_pickle', 'allow_incomplete_nzb',
               'rss_filenames', 'ipv6_hosting', 'keep_awake', 'empty_postproc', 'html_login', 'wait_for_dfolder',
               'max_art_opt', 'warn_empty_nzb', 'enable_bonjour', 'reject_duplicate_files', 'warn_dupl_jobs',