LPD: working again

[dronnikov at gmail.com]

Hello!

The problem of current SVN was that we overwrite subcommand s[0] while reading positive answer from client!
Fixed.
Other changes result in code shrink.

Still I think we setup environment in exec_helper() too restrictive: xsetenv IMO should be reverted back 
to putenv().

Next, I find having two sources of data filename is very bad. We should use the only one (IMO DATAFILE) and rip 
the other completely.

I tried to place comments at any of spots I have changed in patch.
Denys, please consider and comment!

--
Vladimir
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