[PATCH] Hide "Add comment" section if permission is not available

[Alec Thomas]

Bit of a subjective call, but I personally prefer this behaviour. Feel free to ignore :)

[osimons]

(In [2956]) FullBlogPlugin: A number of improvements and fixes:

• Typo in RSS made one of the macro formats (float) not work as expected. Fixed.
• Tags support updated to current trunk of TagsPlugin (>=0.6). Patch by athomas. Closes #2342.
• Links to RSS feeds also in 'Download in other formats' whereever that makes sense. Patch by athomas. Closes #2344.
• Don't display any message or information about adding comment if user does not have permission. Patch by athomas. Closes #2343.
• Some fixes for RSS feed url and logo (logo still not ideal - see ​ticket:6562).
• Delete of last version + all versions now implemented (BLOG_ADMIN permission required).
• New config option personal_blog (default False) will hide 'Browse by author' and various author references. Makes for a cleaner UI when only one author is posting to the blog anyway.