lisa.datautils: Change *_window(method='pre') default value
lisa.datautils: Change *_window(method='pre') default value

Use "pre" default method rather than "inclusive", as "pre" is the right
method to handle signals.

ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa