Assorted documentation fixes

[mahrud]

• removed Citation for packages with no authors
• added release date on package documentation page
• fixed minor issues in NoetherNormalization package
• combine different Sasha Zotines
• combine two Timothy Duffs

[mahrud]

I don't understand why the submodule changes got included in this again. Here's what I see on my system:

mahrud@noether:~/Projects/M2/quickfix$ git diff --stat upstream/development..feature/cite
 M2/Macaulay2/m2/help.m2                          | 12 ++++++++----
 M2/Macaulay2/packages/Brackets.m2                |  2 +-
 M2/Macaulay2/packages/Macaulay2Doc/ov_top.m2     |  2 +-
 M2/Macaulay2/packages/MultigradedBGG.m2          |  2 +-
 M2/Macaulay2/packages/NoetherNormalization.m2    |  5 ++---
 M2/Macaulay2/packages/SimplicialComplexes.m2     |  5 +++--
 M2/Macaulay2/packages/ToricHigherDirectImages.m2 |  3 ++-
 7 files changed, 18 insertions(+), 13 deletions(-)

[d-torrance]

Thanks!