Revert "svn: prevent hanging when reading output from pipes"
Revert "svn: prevent hanging when reading output from pipes"

This reverts commit 0c060a63850f1a97edd5ca63ddf99d29936f24a9 (#254).

As per discussion in #259, use of 'a' for pipe type is not documented in
the PHP manual [1], and the proc_open() call does not work with it
(STDERR returns no output).

[1]: http://php.net/manual/en/function.proc-open.php

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