Minor fixes

into deer.(none):/home/hf/work/mysql-4.1.2way

mysql_fetch_length fixed for embedded library. Now data length is stored
before the data. Pointers in row still points to the data so you have to
get *(uint*)(data_ptr - sizeof(uint)) to get data length

into mysql.r18.ru:/usr/home/ram/work/4.1

into sanja.is.com.ua:/home/bell/mysql/bk/work-optimized_prepared-4.1

Happens when braces are used on a single select, which leads
to the uninitialized global parameters structure.

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

into mysql.r18.ru:/usr/home/ram/work/4.1

into deer.(none):/home/hf/work/mysql-4.1.clean

into sanja.is.com.ua:/home/bell/mysql/bk/work-in-4.1

into deer.(none):/home/hf/work/mysql-4.1.clean

into sanja.is.com.ua:/home/bell/mysql/bk/work-string_parameters-4.1

correct bug 1085 (a problem with min/max functions)
add tests of bugs 833,836,1085

embedded library.

into oak.local:/home/kostja/mysql/mysql-4.1-root

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

into oak.local:/home/kostja/mysql/mysql-4.1-root

into sanja.is.com.ua:/home/bell/mysql/bk/work-string_parameters-4.1

lost.