Empty to, cc or bcc fields could lead to an Internal Server Error:
malformed header from script. Bad header=No recipient addresses found...

This ignores warnings because of the (intentionally) missing url
parameter for the constructor of SimplePie_File.

This increases the indexer version in order to force a rebuild of the
search index in order to "repair" the search index that might contain
uppercase words

This reverts commit 1ca2719c as it is
now superseeded by a6b82e436e3d68a42a6556165d6aaf9249db44cd

This fixes a problem where JavaScript could be introduced through
specially crafted RSS feeds on a lower level than the commit from
yesterday (1ca2719c)

This also fixes a problem where JavaScript links could be introduced by
specifying it as an RSS URL: the resulting error message displays a
link to the broken feed URL. This patch makes sure there's no working
link for unknown protocols.

On certain PHP installations (it has been reproduced with PHP version
5.2.0-8+etch11) the indexer failed to lowercase words in the indexer
so the fulltext search was partially broken.

This fixes a security vulnerability where an attacker could introduce
JavaScript links into wiki pages by including a prepared RSS feed.