Conflicts:
	doc/history.rst

docstring about timeout behavior

Honor 'force=False' when set on p.close()

interact logs by self._log(s, 'read') and 'send'

Improve docstrings about searchwindowsize value

This has no change, both this method and ptyprocess
method signatures match 'True' value.

Closes issue #190: __interact_copy implements
its own read() and write() calls, circumventing
the self._log() system, and omitting to log data
that is sent to the child pty.

Related, resolve old docstring about a setlog()
method that was removed in SpawnBase refactor.

This directly addresses issue #77.

Rephrase first three sentences about the meaning
of after and before.  Instead, immediately address
the availability of the match attribute and its
possible value types.

Instead of 'If an error occured' phrase, use
'On general exception' to better clarify the
onerror() method behavior described here before
re-raising in general 'except:' clause.

In class initializer:
- introduce its default value and its relationship
  to the *maxread* keyword argument.
- reduce explanation search cost relationship

in expect method:
- document its similar re-use of class attribute
  and keyword argument 'searchwindowsize' when the
  value of -1 is used.