Ensure TZipIn::GetFLen() reads the full process output
Ensure TZipIn::GetFLen() reads the full process output

Previously, TZipIn::GetFLen() would only make one call to ReadFile()/fread(),
both of which may return a subset of the child process' output the first time
they're called.  Now, the output is read through to completion.

blazs/qminer,ErikNovak/edsa-server,blazs/qminer,mkarlovc/qminer,mkarlovc/qminer,blazs/qminer,mkarlovc/qminer,ErikNovak/edsa-server,mkarlovc/qminer,blazs/qminer,mkarlovc/qminer,ErikNovak/data-visualization,ErikNovak/QVisual,ErikNovak/data-visualization,mkarlovc/qminer,blazs/qminer,ErikNovak/QVisual,blazs/qminer