* Reformatted several text documents to be a hybrid between wikitext and plain text...

* Reformatted several text documents to be a hybrid between wikitext and plain text, so that they look nicer in the new installer.
* Removed the specialised getFileContents() functions, they are unnecessary now that I have reformatted COPYING into wikitext.

In WebInstaller_Document::formatTextFile():
* Introduced new tab-indented syntax, which is equivalent to colon indents in ordinary wikitext. This was useful for reformatting the GPL.
* Removed the special case for spaces preceding URLs, used tabs instead, with the above feature.
* Removed the "numbers in square brackets" feature. The place where this was used, in README, was an unfortunate case where the square brackets originally indicated a footnote and its reference. Then another two "footnotes" were added with no corresponding reference, they just talked about random license-related stuff that happened to be similar to the footnote. It was never actually meant to be a numbered list. Fixed in README.
* Convert from DOS line endings to UNIX early on, to simplify the regexes.