Flash all data within program memory range

[bessman]

Previous behavior ignored any data which is part of a contiguous block of data if any part of the block is outside program memory range. That's probably wrong.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (7834cc2) 100.00% compared to head (97df431) 100.00%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 6 6 Lines 337 327 -10 ========================================= - Hits 337 327 -10 ``` | [Files Changed](https://app.codecov.io/gh/bessman/mcbootflash/pull/10?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alexander+Bessman) | Coverage Δ | | |---|---|---| | [src/mcbootflash/\_\_init\_\_.py](https://app.codecov.io/gh/bessman/mcbootflash/pull/10?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alexander+Bessman#diff-c3JjL21jYm9vdGZsYXNoL19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [src/mcbootflash/connection.py](https://app.codecov.io/gh/bessman/mcbootflash/pull/10?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alexander+Bessman#diff-c3JjL21jYm9vdGZsYXNoL2Nvbm5lY3Rpb24ucHk=) | `100.00% <100.00%> (ø)` | |

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[bessman]

Superseded by #12.