smd_query v0.6.0

This update brings the following features:

• Tag registration.
• Add <txp:smd_query_info /> tag for those that prefer the security of a tag over {replacements}.
• Add var_prefix.
• Add raw_vals for backwards compatibility but its use is discouraged.
• Add {smd_usedrow} to number only rows you use (thanks, aslsw66).
• Improve security (thanks, Gocom).
• Use article_format_info() and link_format_info() internally (if available).