Got rid of unreliable 'ORDER BY' technique to detect UNION query SQL injection, consequently switch --union-tech has gone now.

Minor code refactoring too.

sqlmap.conf

@@ -255,13 +255,6 @@ timeSec = 5
 # Valid: True or False
 unionTest = False
 
-# Technique to test for UNION query SQL injection
-# The possible techniques are by NULL bruteforcing (bf) or by ORDER BY
-# clause (ob)
-# Valid: char, OrderBy
-# Default: char
-uTech = char
-
 # Range of columns to test for
 # Valid: range of integers
 # Default: 1-20