changing cfg file problems

[janwirwahn]

• if you change info of cfg via app, the old cfg is not deleted (some existing cfg files are not named config.cfg). if you change info in this case, old data is shown in main menu (from a cfg file called 321 heiss v2 22.cfg)
• tried two times changing name, sensebox id and sensor ids. resulted in a second cfg file on sd card called CONFIG.CFG with following content:

NAME=KU_01
DEVICE_ID=68639b5da17d5100076ff139
NAME=KU_01
DEVICE_ID=68639b5da17d5100076ff139

double entry because of changing two times?

-> program should check if there is an existing cfg file and delete this file completely before creating new with infos from form