*  Add --force-* options to skipt .git-slurp-ok file checks.

 *  Allow passing path to slurp.

    You can slurp only a particular sub-tree.

 *  Improve commit message.

    Host has been dropped, and slurped paths are logged (as relative
    to worktree root).

 *  Die by dedicated function.

 *  Push only if allowed (a line containing single word PUSH found in
    .git-slurp-ok file)

 *  Allow working when deeper in git repo (but not if outside).

 *  Make permisson code readable (self-doc).

 *  Enclose in main() to allow for better hygiene.