Package girar-utils: Information

- girar-import: reworked to import only one branch, added ability to
  update existing repository
- girar-remote: fixed usage (closes: #20890)
- Updated manpage for girar-import (closes: #20823)

- New utility:
  + girar-import: clone package from girar archive.

- Global changes:
  + Configured ssh alias is required, dropped -u/-s/-p options
    in favor of -R.
  + Use git-config to store utility options.
- New utilites:
  + girar-clone: clone other's repository from git.alt server.
  + girar-find-package: date formatting interfase to girar's
    find-package command.
  + girar-remote: execute command on git.alt server.
  + girar-remote-uri: construct git URI out of directory name and
    optional user name.