Iocsh Cleanup and Standardization

Simplified using suggestions from Andrew Johnson

Changes to work with newer versions of areaDetector, support new devices, and simplify

Made to work with newer areaDetector; simplified, no special rules; use variables for application and dbd names so it is easy to modify for other applications

Conflicts:
	iocBoot/iocxxx/softioc/xxx.sh

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* allow for command line option to specify the file to be opened
* removed the "&" that started the session in the background; QtCore.QProcess was failing on this

---: # If no startup dir is specified, assume this script resides in the IOC's startup directory

+++: # If no startup dir is specified, use this script's directory