System-wide "svn upgrade" error catcher

[aik099]

Right now the error about non-upgraded working copy is only caught during svn info command execution because this is the 1st command executed to detect if this is a working copy or not.

This however isn't correct behavior considering that result of svn info call is cached for if SVN client is upgraded while cache is still valid then no svn info command is executed and exception about svn upgrade command is thrown.

Proposing to handle error about failed command due non-upgraded working copy right where that exception is thrown and:

1. ask user to upgrade
2. if user agrees to upgrade, then upgrade and retry previous command
3. if user declines to upgrade, then throw exception as before