Remove references, redirects, and selection of mirrors

Fix permissions

Having synced file permissions in Git repositories is a reccurring
issue. Git can track files as executables (0755) or not (0644). Usually,
all files except the execu

Fix permissions

Having synced file permissions in Git repositories is a reccurring
issue. Git can track files as executables (0755) or not (0644). Usually,
all files except the executable ones such as command line scripts or
binary executables, should be set to 0644.

This patch syncs permissions in the Git repository.

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Remove the "usage" page as its poorly outdated (Stas)

Added ChangeLog-7 to the sitemap.xml file (is this even used anymore?)

Most of these don't work, others are just to old.

There is maybe one or two here that are ok, but that hardly justifies keeping this alive

People write browser extension for these things today.

And it hasn't actually been linked for a long time

Kill reST things

It doesn't even render correctly, and has gone more or less unused

I don't know exactly what happened but somehow this long outstanding
todo item got resolved.
I hope noone actually notices =)

Initial rewrite of the references to Subversion on the site to Git. Rewrites
welcome! A couple of important notes:

- I've largely dropped references to Subversion altogether, even knowin

Initial rewrite of the references to Subversion on the site to Git. Rewrites
welcome! A couple of important notes:

- I've largely dropped references to Subversion altogether, even knowing that
php-doc hasn't migrated yet. We may need to put a few more "Git/SVN account"
references in there if php-doc isn't going to be migrated in the near future.

- I've removed the quick start hints from git-php.php after an account request
has been sent in. The documentation there was pretty skimpy anyway and
probably wouldn't have been enough to get a developer going, plus it's harder
to distill the Git workflow into three or four snappy commands and I'm not
really convinced that a form confirmation page is the right place to have
learning materials, since it's a one-time page for most users. Instead I've
replaced them with links to the relevant Wiki pages, which seem more likely
to be the right place for new developers to learn.

News post to come, but I wanted to separate this out for easier review.

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Added sitemap.xml to stop the 404s. This is probably not correct (for mirrors) but maybe it'll work (feel free to adjust). Although really, it's mainly to stop the 404s. :)