Changes:
* Issue warning and remove leading and trailing double quotes from SCONS_MSCOMMON_DEBUG file name when present.
* Issue warning when SCONS_MSCOMMON_DEBUG file name is likely invalid.

Known issues:
* A false positive warning may be issued when a colon is detected in the file name.  An output file and hidden alternate data stream file may be created.

Changes:
* Remove leading and trailing double quotes from SCONS_MSDEBUG_VALUE and issue a warning.
* Catch logging module OSError and FileNotFoundError and wrap in SCons UserError.

…message.

…r immediately.