fncache: remove the rewriting logic
The fncache could rewrite itself during a read operation if it noticed any
entries that were no longer on disk. This was problematic because it caused
Mercurial to perform write operations outside the scope of a lock or
transaction, which could interefere with any other pending writes.
This will be replaced in a future patch by logic that cleans up the fncache
as files are deleted during strips.
Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:
http://docutils.sourceforge.net/rst.html
It's also convertible to a variety of other formats including standard
UNIX man page format and HTML. You'll need to install Docutils:
http://docutils.sourceforge.net/
Use the Makefile in this directory to generate the man and HTML pages.