[PATCH] Small edits to user manual V4.7

[Robert Helling]

Hi,

> On 21. Oct 2017, at 15:15, Willem Ferguson <willemferguson at zoology.up.ac.za> wrote:
> 
> I am in East Africa for the next 2 weeks, basic and slow Internet connection next week, probably no Internet week after. Next week I may be able to respond to some user-manual issues.

before merging, two typos should be fixed:

s/thet/that/
s/rectengular/rectangular/

Best
Robert
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