Improve importer performance.

[Christian Stimming]

Log Message:
-----------
Improve importer performance.

2004-11-27  Christian Stimming  <stimming at tuhh.de>

	* src/import-export/import-backend.c
	(gnc_import_find_split_matches): Improve importer performance by
	matching imported transactions only against transactions in the
	proper time interval.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/import-export:
        import-backend.c