Made some more sections headed with a comment and moved lines there.
Added a Vim modeline so that Vim will treat .gitingore as a config file.
If the same file is opened mulitple times by separate instances of Vim, the first swap file will be .FOO.swp, the second .FOO.swo, the third .FOO.swn, and so on; deal with having up to three swap files.
A "/" at the start of a filename matches the local repository root, so (for example) "/dat" will only match a file named "dat" if it's in the top-level directory, rather than matching "dat" anywhere.
A "/" at the end of a filename means that the file must be a directory, so git-status will still note the file's presence if it's a link or normal file.
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