#1 PDF417 'Macro' feature

[Vladislav Naumov]

I implemented PDF417 'Macro' feature. (Thanks Paulo
Soares for help!)
Preliminary version is just a quick-and-dirty hack, no
optional fields are supported (except of "Segment count")

String like this (being last string in an input file)
generates a
Macro Control Block:
MC "FileID ZZZZZZZZ Segment 2/2"

This patch also calculates right Postscript image sizes
and fixes some stupidities in code.

[Vladislav Naumov]

diff file for v3.4