Beware - frename bug in RL-FS !

Again, for those who use Keil's middleware - FAT frename function has a nasty bug:
if new name contains path (for example "M:\name.txt") the whole string will be used as new name.
In this particular case, file will be renamed to M:\name.txt - and now it's not accesible anymore
since it contains forbidden characters ':' and '\'. Behaviour is completely wrong. If the path
is specified, frename should copy old file to specified destination. In my case, I've created
a wrapper function that corrects this issue, which I call instead of frename.

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