Updated external hyperlinks for RST format

Currently not sure about internal (wiki) links.
Minor formatting changes for RST
Updated internal (relative) wiki links

Seems like making bold links is difficult.
Minor clean-up
Minor cleanup
Minor cleanup
Minor Cleanup
Edited for clarity

The old version had a lot of redundancy; also, couldn't find any reference to "checkmark_controller".
Minor Cleanup

Edited redundancy in "mandatory groupings" section
Cleaned up "How to keep up to date" section

Merged in the (little) extra info contained in the pages "Gitrebasefeaturebranch.rst" and "Gitkeepingpace.rst", which I intend to delete.
Merged into GitHowTo.rst
Merged into GitHowTo.rst
Merged in Git_Workflow.rst

Seems like that file was based on this one, but this one has had more recent activity.
Merged into GitHowTo.rst
Not really appropriate for a wiki

This is an old abstract of a paper that's now been published; seems to me like it would be appropriate on our main page to link to the actual article, but remove this abstract page.
Formatting changes for reStructuredText
Merge pull request #39 from david-yz-liu/master

Cleanup: reStructuredText markup & minor edits