Rewrote upload to use the newly introduced sort-packages program.

While here, ...
- Added stricter checking by using "set -eu".
- The bulk build configuration file is properly included, and the
  MAKECONF definition that it may contain is properly exported.
- All progress messages and error messages are prefixed by "upload>",
  so that it is obvious where the messages come from.
- Since extracting the make(1) variables takes quite a long time, print
  an informational message before doing that.
- Removed the use of the error-prone lintpkgsrc to detect whether a
  package is restricted or vulnerable.
- If an error occurs, the upload program returns an exitcode of 1,
  which is common among Unix utilities.
- Removed almost all pipe operators, since they tend to hide program
  failures.
- All error messages are redirected to stderr instead of stdout.

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