Manually merged the PATCH files from upstream up until Jan 26, 2020.

Looks to only fix a single bug related to reading past the end of a file
in certain cases.  Other new features (secure erase) are included to
make it easier to merge any future releases, but are not enabled in the
core.

Merges included:
20fc6df0ab2bee391961b5f823a327887abc96b4
da1cf494796d68bb5c02ba70cf78a904db08a170
13935985cdde6d6b4ec77f2685264242ee55e7ac
ec68ba8208d7550860e4e78299d58a529b88bf85
f59d958e0b2f169b549e5cdc293a70bc6873cd45
f7d3e9f2b207958dfc2c01cf3fc42f98a4b9b239
554b59c147d96223ccce18374989f191f7222b45
07e013056dd976d12ae36db5c54a275e1497f6c8
d0d44c4908efff7a443ed9b1174d9173fb784a72
3cb24dbfd32a396dca46a7ca56a8e75bdcb97078
8172b40813ff36aa0df4c88a6e9c76e5300d7e32