small fixes in backtrace code

added message on all segfaults, and numeric backtrace of Linux i386
introduced a bug into ENCRYPT() to test backtrace - will clean up
before push, but need this commit locally to pull on slave repositories
to do further testing

Portability fix for Linux

Fixed my_print_defaults --no-defaults 

into cane.mysql.fi:/usr/home/tim/my/work

Added mysqltest for <=>
Removed use of TAB in output from mysql-test-run

New test for string functions

    forgot to check this in

    fixed bug that created empty result files in no-record mode
mysql-test/t/rpl000007.test
    testing non-replication of load data infile when the table is excluded from replication
mysql-test/t/rpl000016.test
    test purge master logs
sql/slave.cc
    fix memory leaks found by  purge master logs test
sql/sql_repl.cc
    fixed race condition and delete before close bug in reset_slave()

Overall comments - coverage testing is a very good thing!

    added system command
myisammrg/myrg_open.c
    fixed coredump when opening an empty union table
sql/sql_repl.cc
    fixed warnings, remove confusing comment, fixed coredump in
    change master to when master.info was corrupted

added new replication test case

    fixes for Bourne shell
    removed colors
    optimized echo/expr for bash

    fixed typo
scripts/make_binary_distribution.sh
    added .MRG and .frm files

mysql-test-run.sh	fixes for distribution
Makefile.am	Fixes for distribution

into mysql.sashanet.com:/home/sasha/src/bk/mysql