protected call to open sidecar history file
This should fix #724.
Merge pull request #726 from chrox/master

protected call to open sidecar history file
Revert "Moar cosmetic fix!"

This reverts commit 8222ba14e78c58fd1df1b094c849fc5604109d92.
Revert "Cosmetic fixes."

This reverts commit e8d5189f07185bec424ab991be6750ac4fe8e975.
Revert "Possibly fix sidecar settings on Kobo external SD"

This reverts commit 114268f6dad41a0baf59b1fc55265d992b2f69f8.
Merge remote-tracking branch 'upstream/master'
Update koreader-base

Kindlo/Kobo compat CFLAGS tweaks