Overview with instructionset for each software release

I'm still using l release 1.6.1. I had problems to convert a string to a float but there is no instruction in my release.

Has anybody an Excel-file with ALL instructions per release?? It will be helpfull to study wich commands are available in newer versions (of course I know the map with Examples).

I don't know of one, but you can certainly browse the Release Notes: https://www.arduino.cc/en/Main/ReleaseNotes

1.6.5r5 seems to be the one folks say is the latest, most stable/bugfree version https://www.arduino.cc/en/Main/Donate

I still use 1.0.6 myself for 328P, 1284P, and 2560 projects.

The Arduino IDE allows you to use the vast majority of C++ functions.

I had problems to convert a string to a float but there is no instruction in my release.

What problems ? The atof() function is well documented and is not an Arduino specific function.

Has anybody an Excel-file with ALL instructions per release??

What, a list of the C++ functions available in each release ?