file65 options to output segment addresses

[fachat]

To create proper load addresses from an o65 file, file65 should be able to extract a segment start address and print it either in hex (lo/hi), or other formats.

proposal:

• Option "-H?" prints segment start address of segment ? in hex in two bytes in low/high format
• Option "-D?" prints segment start address of segment ? in decimal

[fachat]

.. and / or maybe add "-L" to write out the correct load address into the xt data output (in reloc65)

[fachat]

This is the alternative way of prepending the load address to an extracted binary (from a Makefile):

        file65 ../kern.o65 | grep text | tr -s " " | cut -d " " -f 5 | sed -e 's/\$$//g' -e 's/\(..\)\(..\)/\2 \1/' | xxd -r -p > kern.bin
        reloc65 -xt -o tmp ../kern.o65
        cat tmp >> kern.bin