bfs_shell: Fixed (missing) use of the FSSH_B_PRI* macros.

* This closes ticket #12657.

Reset the counter after each pass.

Implemented repairing index b+trees.

* There are now two passes in case a corrupted index tree has been found.
* The second pass will clear the affected indices at first, and will then walk
over all inodes again to fill them.
* As a side effect, this will also defragment the indices; ie. the same
mechanism could be used for this some day.

Added support for reporting invalid B+trees.

* Fixed the inode progress not being overwritten by the final stats.
* Minor cleanup.

Build fix -- accidently committed stuff that doesn't exist yet.

* Also removed debug leftover from register_additional_commands().

Added "checkfs" as additional command for the bfs_shell.

Reset the counter after each pass.

Implemented repairing index b+trees.

* There are now two passes in case a corrupted index tree has been found.
* The second pass will clear the affected indices at first, and will then walk
over all inodes again to fill them.
* As a side effect, this will also defragment the indices; ie. the same
mechanism could be used for this some day.

Added support for reporting invalid B+trees.

* Fixed the inode progress not being overwritten by the final stats.
* Minor cleanup.

Build fix -- accidently committed stuff that doesn't exist yet.

* Also removed debug leftover from register_additional_commands().

Added "checkfs" as additional command for the bfs_shell.