kes Move unserial code in restore.c to a subroutine. Add a bit of debug

kes  Move unserial code in restore.c to a subroutine. Add a bit of debug
     code.
kes  Rework a bit of code in backup.c to handle sparse blocks correctly.
     The main problem was that signatures were being generated on blocks
     of zeros, which is unnecessary.
02Dec06
kes  Fix scanner (next_arg) to handle leading double quote correctly.
kes  Modify cd command in restore tree to look at full argument without
     keywords.  This fixes bug #716.
01Dec06
kes  Do not update Migrated Job type if migration does not terminate
     normally. This fixes bug #719.