Suppress <project_specific> XML, please

[Ageless]

As noted before in the BOINC 6.1.8 released for Windows thread on BOINC_Alpha in January, BOINC shows a lot of unparsed_xml notices on startup, but also later when it contacts certain projects that use 'unknown' XML.

David said at the time in the thread "This XML is supposed to be within the <project_specific> element. Maybe I'll suppress this, but for now just ignore it."

I am now requesting that it be suppressed. Preferably before the release of BOINC 6.2 as it is causing some confusion already amongst people who have a cc_config.xml with the <unparsed_xml/> tag on.