Simple Flash Key Value store

Tries to keep flash wear low by continuously appending data, automatically erasing and rewriting when full.

Store requirements

• Reading must be possible by memory-mapping a &[u8] slice
• Must support erase() for compaction,
• Writing must support program() with an offset and &[u8] payload

For details see trait StoreBackend.

Ideas

• iterator (quadratic)
• compaction to a second backend instead on stack
• StoreBackend-configurable erased data detection