Great finds... I'm not a bash/sed/curl programmer, but I agree it looks like it can be done in a simplere way.
Love the find on tweakers, will take a look into it.
Btw. the wiki article is quite simple, it installs some stuff, if you follow the step by step it does work, but I agree it can be ...

So has anyone that responded a suggestion how to solve this? Seen a library or a other open source project that we could look at to take the reporting module from?

Anyone?

i guess you already know the answer of this as you did not find this option.
Please propose a patch that does this

Nope, I didnot know. But now I do... hm, let me think about this.

The thing I want to to is to visualize the temperature sensor (virtual weatherstation) and the gasmeter readings ...

Is it possible to combine a Tempearture Sensor and let's say Gas Usage in a single graph?
If the answer is yes, can you explain how?

Thanks...

After working on it for a week I have created a script that will post data to the website: mindergas.nl

If you don't mind your data being on an external webservice, then you can use this script.
I am still testing the correct working of the script at this time, but it looks like it works just fine ...