Zenario 7.0.6b bug fixes

• Fixed a SEO problem with Google where the provided robots.txt file blocked some files that Googlebot needed to see.
• Fixed a bug where web-crawlers could go into an infinite loop in certain situations if you turned the "Show menu structure in friendly URLs" option on.
• Fixed a bug where not setting an alias on a content item caused an infinite redirect loop if you used a language-specific domain.
• Fixed a bug where the files in the cache/ directory and the private/ directory were not being deleted.