spamprobe 1.0 released

Well it's here at last! Spamprobe 1.0 is out. Changes in this release include:

* added exec and exec-shared commands to allow running a command in a shell with SP holds a lock on the database (inspired by Graham Toal)

* added --enable-big-endian to configure to force SP to always store term counts in big-endian format (thanks to Jon Rust for sponsoring this feature!)

* added debian compatibility changes to configure contributed by Siggy Brentrup.

* fixed a problem with import command ignoring negative term counts (the fix allows users to create "diff" files to synchronize multiple databases)

* Revised man page and readme