updates to vss2cvs.pl script

[Laine Stump]

Based on some enhancements and ideas I received from Ephraim Ofir, and
finding some bugs during a fairly large conversion attempt, I've
updated vss2cvs.pl and put the new version at:

   http://www.laine.org/cvs/vss2cvs

Here's my commit log of the changes. Note that the two bugs I
found/fixed could be important for anyone who previously converted and
didn't watch the output for errors - you may have ended up with
incomplete/inaccurate history!

----------------------------
revision 1.5
date: 2000/11/09 19:50:38;  author: laine;  state: Exp;  lines: +91 -111
* Change method of setting entire directory to branch to speed things
  up (idea from Ephraim Ofir).
* Gather list of filenames from ss dir command rather than running
  separate ss properties command, again speeding things up (idea and
  code from Ephraim Ofir). NOTE: this may break the ability to
  properly convert files which are in the "save latest version only"
  mode in VSS - I don't have any such files, so I can't say for sure.
* don't make cvs add dependent on finding a revision 1 of file in VSS
  - sometimes they start at a different revision (idea from Ephraim,
  code from me).
* Explicitly supply directory name to ss get to avoid inadvertant gets
  to the wrong directory "when ss feels like it".
* Add -r global option to cvs co, update, commit commands to guarantee
  that file in working dir is always read-only (otherwise, ss get
  barfs). The lack of this, and of the previous change, had caused
  numerous incorrect results in the past.
* add access mode to mkdir call, so the script will run with older
  (5.00x) versions of perl.
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