Directives: Flow control directives

<sql if> - conditional execution and output.
<sql foreach variable> - iterate over instances of a form variable.
<sql foreach-file variable> - iterate over instances of a file received from the browser.
<sql eachline variable> - iterate over all lines in a form variable.
<sql include> - interpret an external dbCGI file.
<sql exit status> - exit dbCGI.
<sql reparse> - parse a section after processing formatting escapes