add PDFA converting script

pdfa.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Use this script to convert random PDFs to PDF/A (e.g. figures).
+# Unfortunately, ghostscript can not retain the PDF/A metadata. In result, if
+# you use this on the thesis, it _will_ become PDF/A compliant (and SIS will
+# accept it), but won't contain the magic PDF/A "stamp" and will show only as
+# normal PDF-1.4. :(
+gs -dPDFA=1 \
+   -dBATCH \
+   -dNOPAUSE \
+   -sProcessColorModel=DeviceCMYK \
+   -sColorConversionStrategy=UseDeviceIndependentColor \
+   -sDEVICE=pdfwrite \
+   -dPDFACompatibilityPolicy=3 \
+   -sOutputFile="pdfa-$1" \
+   "$1"