micjabbour

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# forked from https://gist.github.com/mp4096/1a2279ec7b3dfec659f58e378ddd9aee
# Modified to:
# 1) Create PDF files beside the converted PPT files
# 2) Skip already converted PPT files (if a PDF file with the same name already
#    exists)
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# Batch convert all .ppt/.pptx files encountered in folder and all its subfolders
# The produced PDF files are stored in the invocation folder
#