(bug 29902) Clean up InitialiseSettings.php, step 4/∞

This patch aims to clean up a part of InitialiseSettings.php
(namely $wgNamespaceAliases) by:

  #1: Removing redundant aliases for Wikibooks, Wikinews,
      Wikiquote, Wikisource, Wikiversity and Wiktionary
      wikis, since they are already defined at the start
      of the section for whole families of those projects;

  #2: Cleaning up weird spacing and indentation, especially
      for the Czech wikis;

  #3: Replacing numeric values for namespaces with their
      constants per bug 29902 comment 7 (by Reedy);

  #4: Removing almost all aliases used by the Romanian
      projects, since they are already defined globally
      in MessagesRo.php in MediaWiki core;

  #5: Repeating #4 for udmwiki (see MessagesUdm.php for
      the relevant aliases);

  #6: Replacing hashes (#) and URLs to Bugzilla with double
      slashes (//) since that seems the current standard.

Note: Except for removing redundant aliases for rowiki and 
udmwiki, and cleaning up spacing and indentation, I'm not 
touching any definitions for Wikipedia wikis because they 
scare me.

Bug: 29902
Change-Id: I79abae074a4b4a5ea82aeec65cf2c90618d8ecb4