LPD: helper support rewritten again

[dronnikov at gmail.com]

Hello, Denys!

The order of data and control files is not important now.
Comments are clarified.

Environment manipulation seems to be very tricky!
Reading mans I discovered that:
* We can not free the string we have just passed to putenv() because it results in broken environment. 
* And we can not use setenv() because it seems to be leaky. 
In either case we loose some memory! 

So what to choose?! I have chosen to use putenv().
May be we should compose the whole environment "by hands"? 

--
Vladimir
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