[HaTeX] HaTeX 3.6.1.0: TikZ extension and some math functions

[Daniel Díaz Casanueva]

Hello HaTeX users!

A new version of HaTeX is now in Hackage. This is just a small revision,
with some additions and documentation improvements.

* Sum, Product and Integral symbols have been added to the AMSMath module.
* Now the TikZ scripter is able to add LaTeX code inside the pictures.
* Added rotation transformation to TikZ scripts.
* Some minor documentation improvements.

Also note that the package dependency versions have been bounded to avoid
buildings with versions that are incompatible with HaTeX. Now it is more
likely that every "cabal install hatex" will work.

Finally, a new function has been added to the TikZ.Simple module. The
function 'pathImage' creates a figure from the image of a path function. An
example of the output:

http://daniel-diaz.github.io/projects/hatex/spiral.png

The code is just (copied from the package documentation):

 spiral :: Figure
 spiral = LineWidth (Pt 2) $
     pathImage 0.01 (0,4) $
       \t -> ( a * exp t * cos (b*t)
             , a * exp t * sin (b*t)
               )
   where
     a = 0.1 ; b = 4


Also note that now HaTeX is under the category LaTeX in Hackage, and that
the label "Experimental" has been removed.

Good luck and have a nice hacking!
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