Fix flags handling for the install program. Properly set and clear flags

Fix flags handling for the install program.  Properly set and clear flags
as requested on the command line, retaining any unspecified flags on the
source when creating the target.

The dump and history flags are special-cased.  The dump flag is not set
unless explicitly specified (as per previous behavior), and the user-history
flag is not transfered to the target and is left as the system desired
when the target was created.