option -e does not work

[GoogleCodeExporter]

What steps will reproduce the problem?
1. pump data to a new database
2. pump the same data to the same new database (without recreating it) and 
specify -e to delete the existing rows
3. this will fail when fbclone tries to activate primary keys

This is because the operator used in fbclone.cloner.pas line 274 is wrong. The 
operator used is the superset ">=" operator, it sould be the subset operator 
"<=".

Original issue reported on code.google.com by [email protected] on 16 Nov 2012 at 11:24