allow caching of page if reCaptcha is the captcha handler

#518
fix SOJOBO-ADV-13-01

fixes possible Cross Site Scripting in mergedRSS.php
fix SOJOBO-ADV-13-01

escapes the $wp_prefix string to prevent sql injections
some code cleanup for the comment tab
report missing images that are stored in database fields
remove some line breaks that looked bad
fix typo
Merge remote-tracking branch 'origin/master' into 1.4.6

Conflicts:
	zp-core/locale/fr_FR/LC_MESSAGES/zenphoto.mo
	zp-core/locale/fr_FR/LC_MESSAGES/zenphoto.po

	modified:   zp-core/admin-plugins.php
	modified:   zp-core/functions.php
	modified:   zp-core/zp-extensions/cacheManager/cacheDBImages.php
	modified:   zp-core/zp-extensions/comment_form/admin-comments.php
	modified:   zp-core/zp-extensions/mergedRSS.php
	modified:   zp-core/zp-extensions/reCaptcha.php
	modified:   zp-core/zp-extensions/wordpress_import.php
	modified:   zp-core/zp-extensions/zpCaptcha.php