HPCC-11598 Autogenerate 'OriginalTextFilesPath' stored variable for setup & some log generation fixup


Add code to generate 'OriginalTextFilesPath' and pass it along with
'OriginalTextFilesIp' CLI parameter to setup ECL programs via stored variables.

Add fix some log generation problems:
- large amount log entries sorting problem
- setup log file naming problem
- mix-up log entries among the clusters log files when the target is 'all'

Update README.rst

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>