BUG: Fix output node selection and error reporting

[lassoan]

• Allow using output nodes that have special characters in the name (for example, if output node contained square brackets [] in the name then SimpleFilters module threw an error)
• Do not overwrite input volume by default (user needs to explicitly select the output)
• Use a label instead of a checkbox to indicate that the selected output node is a labelmap. Users were confused by why the checkbox is there and why it was disabled.
• Make all errors visible to users (for example, when running ResampleImageFilter on MRBrainTumor1 sample data set with default parameters, the execution silently failed)
• Print stack trace to application log to help troubleshooting for developers

[lassoan]

@jcfr it would be great if you could merge these improvements. It makes Simple Filters module more robust and easier to use.

[lassoan]

Thank you!