More abcfield.py updates and mark it Python 3. - Move title fixups into Python. - Move key display name expansion into Python. - Add Dottes-specific header continuation line format. None of the usual tools appears to support the official +: continuation.

#!/bin/sh

if [ $# != 1 ]; then
    echo "Usage: make.sh <book dir name>"
    exit 1
fi

booke=$1

find $booke -name "*.abc" | sort | xargs abcm2ps -F dottes.fmt -O $booke.ps