if nothing (or --with-botan) is specified it will be taken from $PATH, if --with-botan=dir is specified it will be taken from $withval/bin
If --without-botan is specified configure will print an error

Conflicts:
	configure.ac
	doc/Doxyfile
	src/lib/Makefile.am

Also updated includes (because of the lib/util move)

noticed in previous review, but forgot to mention that.
very trivial, so decided to push it directly.

also made the friend declaration more specific

Conflicts:
	ChangeLog
	src/bin/stats/tests/b10-stats_test.py

redundant blank line.

The problem was, it was increased after invalidating once before
checking the condition again. It is probably harmless, but according to
the letter not legal.

It seemed this function is supposed to remove given element from list,
but the counting was somehow confused.

It used iterator with different comparator. Glibc stl with debug mode
rejected this while trying to compile it.

commit f6aa7d59

 - changed the redirection
   302 would be responded only when it's requested with '/' and there is a Host
   header, in other cases, 404(NotFound) would be responded.
 - added more description into the document according to the above change
 - added grammatical fix into the document
 - regenerated the manpage

This reverts commit d7cf894e.

 - checking the type of object returned from open_template method
 - checking the string values replaced by the substitute method in string.Template

tenatively okayed on jabber.  if inappropriate it's easy to back out.