Rewrite this module's book-opened-hook into C.

[David Hampton]

Log Message:
-----------
Rewrite this module's book-opened-hook into C.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash/src/import-export/binary-import:
        Makefile.am
        druid-commodity.c
        druid-commodity.h
        gncmod-binary-import.c

Removed Files:
-------------
    gnucash/src/import-export/binary-import:
        binary-import.scm
        gw-binary-import-spec.scm