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creating an environment variable is handled directly from the perl code.  

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but having it on tmpfs gives a big speedup. 

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- When --record is passed to mysqltest the whole testcase should be executed
as it normally is while the output form the test is acumulating
in ds_res. When test has finished ds_res should simply be written to the
specified result file(if any) instead of comapring it against the result file.
Simplify handling of --require and also the cecking of result files by splitting
check_result function into one  function 'check_require' that is specialised in
checking require's and leave 'check_result' to do just that.
- "mysqltest --record" has been considered unsafe, but with this really simple
logic, it should be safe to use.

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from var/ to a tmpfs area and thereby speed up the execution of the testsuite
 significantly

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Some variable names in 5.1 is soo long that there is no space inbetween 
name and value. Outputing a warning about it, as that should probably be fixed.
At least one space should be put between the name and value.

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Improve check of wheter test case need slave cluster

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Set the environment variable NDB_STATUS_OK to indicate that cluster is installed ok. This is actually not needed for this script as it will
skip ndb tests if cluster install failed. But provided for compatibility

I.e take advantage of the fact that a # comment is always terminated by a new line 
Add tests for the above

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Get server version from mysqld

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Fix detection of debug binaries. If mysqld ouputs "debug xx" in the variable list it's a debug binary

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