[rdiff-backup-users] feature suggestions

[BDV]

Hello,

1. Clean escape in case of a version mismatch
If rdiff-backup detects a difference in the rdiff-backup versions used in a 
network setup, it should print a error message and exit. 
Now it prints a warning and crashes. Due to the python dump, newbies get the 
impression rdiff-backup is unstable software.

2. backwards compatibility
I know this is hard to implement. But in a large network, you can't live 
without. (think http 1.0 and http 1.1, ssh 1 and 2)
That's my suggestion for future versions. Provide some level of compatibility 
between stable releases of rdiff-backup. So you only have to upgrade the 
rdiff-backup install on you backup server(s).

Thanks,

BDV