Add f3write --keep and f3read --delete parameters#140

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brianpow wants to merge 7 commits intoAltraMayor:masterfrom

brianpow:master

Commits on Jul 19, 2020

add --keep parameter to keep existing NUM.h2w files
brianpow
committed

Commits on Jul 20, 2020

add --fix parameter to run f3fix automatically if counterfeit memory detected
brianpow
committed
add --delete parameter to delete corrupted NUM.h2w file
brianpow
committed

Commits on Jul 29, 2020