* Make all counter limits default to none so that people don't get confused
* In clear_opensessions depending on sql type use either IS NULL or = 0 in the DELETE statement.
We need to find a cleaner solution to this. This closes bug#175
+* Log somewhat more verbose error messages when the sql_command binary is not found in the bin scripts
Ver 1.75:
* A LOT of security related fixes. Now dialupadmin should hopefully be secure enough to
be accessed by normal users (not administrators).