New handling of volume exponent; and assorted scratch_pad additions #297
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This PR is primarily to implement a new way to handle the volume exponent; the new way avoids calling
.draw()which in turn eliminates the bug mentioned in issue #296, and also mentioned/described in a previous email from S.G. (commit 2c88663)This PR also includes a lot of scratch_pad work for investigations of various issues (#282, #236, #241), and for an mplfinance presentation: including comparison of old and new api's, intraday animation with volumes, generation of animation gifs, etc.