Simtool

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* Added new parameter classes Tag and File.
* Use checksum and file size to compute sim2L run squidId.
* Improve eapermill efficiency by reducing implicit I/O done during execution.
* Added support for sim2L metrics collection - record hit and miss by squidid.
* Added getParamsFromDictionary() and content() methods to standardize processing on INPUTS in sim2L notebooks.

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* Extend utility functions for getting information about input files to use either parameter or simple dictionary description.
* Prepare for newer papermill versions

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* Trap missing simToolSaveErrorOccurred and simToolAllOutputsSaved in result notebook
* Return list of input files whether inputs is specified as dictionary or YAML
* Add run preparation method used for web service application. Previously used external shell script

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* Verify location of installed or published sim2L notebook
* Differentiate between missing path and wrong path type (file/directory)
* Stricter enforcement of param attributes
* Retain directory structure when saving results.
* Close open files to avoid file descriptor leakage
* Added magic functions needed to run notebooks in parallel (MPI)

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* Improved automatic documentation generation
* Fixed Image value setting

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* Fixed for use outside of HUBzero environment