Replace the random boolean parameters on Title::getURL() with a set of

Replace the random boolean parameters on Title::getURL() with a set of
practical, clear methods:
  Title::getLocalURL() - "/wiki/index.php/Foobar" or "/wiki/index.php?title=Foobar&action=edit"
  Title::getFullUrl() - ditto with $wgServer on the front
  Title::getInternalUrl() - ditto with $wgInternalServer on the front (for some squid-related functions)
  Title::escapeLocalUrl() - local URL escaped for HTML output
  Title::escapeFullUrl() - full URL escaped for HTML output

All take an optional query parameter.

Title::getURL(), wfFullUrl() and wfFullUrlE() are now officially
deprecated and will result in instant death. wfLocalUrl() and wfLocalUrlE()
will be killed shortly; they are still used in the language files.