Diff against 7.15 list

With files run a compare (check) of the archive's content against one or more directory. In fact this is a 'verify' more than a 'list'.
The old "Data analysis" made by zpaq is removed, so the

  zpaq list backup dir1 -to dir2 -not =             (compare dates)
  zpaq list backup dir1 -to dir2 -not = -force      (compare contents)

does NOT work anymore.
This is the greatest backward incompatibility of zpaqfranz

The comparison is much faster than the standard, as it only performs a block calculation of the SHA1 codes of the file present in the filesystem, while those archived are not extracted.

It also checks the CRC-32, to intercept any (very rare) SHA-1 collisions.

After add() you can list() with just the same parameter and do a very quick (but safe) verify.

zpaqfranz a z:\1.zpaq c:\z
zpaqfranz l z:\1.zpaq c:\z