Resolves: bz 223506: gfs2_fsck: fatal: invalid metadata block
    This is a crosswrite from gfs1.
    1. Fix a memory leak in pass1b.
    2. Improve performance of pass1b by combining loops through fs.
    3. Give an error message and abort if file system > 16TB and node
       architecture is 32-bits.
    4. Give users an "Abort" "Continue" and "Skip" if they interrupt
       with ctrl-c.  Also, report progress for that pass on interrupt.
    5. Added more "percent complete" messages for other passes.
    
    See bz comments for more details.