[changeset] update of the documentation chapter on strings (strings.txi)

[Thorsten Meyer]

Hi,

attached is a changeset with an update of the strings chapter in the manual.
I added text around the docstrings and changed the structure in a few places:
 - I moved the explanation of escape sequences to a separate section (now
one does not have to scroll down to get to the section menu)
 - I made the part on character arrays a separate section (imho this is
important enough to get its own section)
 - I split up the section "Creating Strings" into two subsections
"Concatenating Strings" and "Conversion of numerical data into Strings".

Feedback would be very welcome.

Thorsten
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