[git/el5] (7 commits) ...Merge branch 'master' into el5

[Adam Tkac]

Summary of changes:

  e313d82... Update asciidoc requirements, drop unsupported ASCIIDOC7 (*)
  ff981ce... Define GNU_ROFF to force ASCII apostrophes in man pages (so (*)
  dae8588... Install tcsh completion (requires manual setup by users) (*)
  f8c03bb... Clean up dist conditionals, don't pretend to support EL-4 b (*)
  c3202fd... Use prebuilt documentation on EL-5, where asciidoc is too o (*)
  83fc4ea... Respect gitexecdir variable in git-subtree install (*)
  bbd216e... Merge branch 'master' into el5

(*) This commit already existed in another branch; no separate mail sent