Censor passwords in arguments so that they don't get printed by

describe_backtrace.

Rev: lib/modules/Sql.pmod/Sql.pike:1.90
Rev: lib/modules/Sql.pmod/mysql.pike:1.40
Rev: lib/modules/Sql.pmod/postgres.pike:1.27
Rev: lib/modules/Sql.pmod/rsql.pike:1.12
Rev: lib/modules/Sql.pmod/sybase.pike:1.11