Prepare gnc hook architecture to combine C and Scheme.

[Derek Atkins]

Log Message:
-----------
Prepare gnc hook architecture to combine C and Scheme.

	* src/core-utils/gnc-hooks.[ch]: rename some functions, set up the
	  architecture to handle SCM and C hook danglers all in the same
	  place.
	* src/app-file/gnc-file.c:
	* src/core-utils/gw-core-utils-spec.scm:
	* src/gnome/dialog-new-user.c:
	* src/gnome/top-level.c:
	  point to new gnc-hook function names

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/app-file:
        gnc-file.c
    gnucash/src/core-utils:
        gnc-hooks.c
        gnc-hooks.h
        gw-core-utils-spec.scm
    gnucash/src/gnome:
        dialog-new-user.c
        top-level.c