Replace the text formula with a png graphic generated from some
LaTeX source.
Formulas in HTML apparently never made it in the mainstream,
and the recommendation is to use LaTex to generate images. See:
https://www.w3.org/MarkUp/HTMLPlus/htmlplus_45.html

To convert the .tex to a png, try:
  pdflatex formulas.tex
  convert -density 300 formulas.pdf -quality 95 formulas.png

Signed-off-by: Graham Whaley <graham.whaley@gmail.com>

Note in the GUI help text that the ToneDetect uses the
Goertzel algorithm.

Signed-off-by: Graham Whaley <graham.whaley@gmail.com>

...pls don't forget to copy the css to the website.

ok, the previous issue is now fixed, too.

There is one very minor issue remaining:
If you click "reload"" the first node get no error-icon.
With the fist click to the workspace it reappears.
I'll do not fix that now.
Maybe one day.

+ check both for "shareable"

Step #1
Load and check for requirements.
Output - at the moment - on Javascript console.
Step #2: Make conflicts visible (with an Icon), and with a Text-Hint, eventually

Test here: https://forum.pjrc.com/threads/60109-Audio-GUI-for-T4?p=241364&viewfull=1#post241364

https://forum.pjrc.com/threads/45216-Two-GUI-related-bugs

Please merge afer relase of 1.52 - needs more testing.
however, the examples from that thread seem to work now.

https://forum.pjrc.com/threads/52679-Teensyduino-1-42-Released?p=181195&viewfull=1#post181195

https://forum.pjrc.com/threads/48304

https://forum.pjrc.com/threads/45246-Issues-with-tonesweep-in-audio-library