Idempotent and documented better.
 Changes to be committed:
	modified:   ipoerpPatchOpenErpLauncher.sh
	modified:   ipoerpPipInstallToVEnv.sh
	modified:   ipoerpPreparePgUserAndTablespace.sh
	modified:   ipoerpPrepareUsersAndDirectories.sh
	modified:   ipoerpSituateOpenErpSourceCode.sh