Added support internally to forge CASE statements, used only by
--is-dba query at the moment.
Allow DDL, DML (INSERT, UPDATE, etc.) from user in SQL query and
SQL shell.
Minor code adjustments.
by providing option --headers. By default Accept, Accept-Language and
Accept-Charset headers are set.
Added support to get the injection payload prefix and postfix from user.
Minor bug fix to exclude image files when parsing (-l) proxies log files.
Minor code adjustments.
Updated documentation.
