[Rpm-maint] [rpm-software-management/rpm] Allow better usage of %trace mode in rpmspec -P (#161)

[Peter Jones]

This removes an old hack to make %trace output fit on small screens, as well as adding a --trace macro to rpm commands to make it easier to use.

Note that this patch series includes the independently useful patch that I've added separately as https://github.com/rpm-software-management/rpm/pull/160 , simply because otherwise there would be a merge collision between the two pull requests.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/161

-- Commit Summary --

  * Bounds check strings to print correctly in %trace mode.
  * Add --trace macros to enable %trace on the command line.
  * Don't nerf "rpmspec --eval '%trace' -P foo.spec" output with ellipses.

-- File Changes --

    M rpmio/macro.c (26)
    M rpmpopt.in (6)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/161.patch
https://github.com/rpm-software-management/rpm/pull/161.diff

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