Eliminated need to use edit installation mode during executing a pip tool....

Eliminated need to use edit installation mode during executing a pip tool. This fixes problem appeared lately when pip tool has been upgraded up to version >= 21.0 where edit install mode support has been dropped.
Also improved detecting of old setup tools - now too old setuptools should result in installation error.
SQL scripts are added now as package resources (instead of other datafiles) what is preferred way to distribute other data files.