fix #431, fix export cancels, and more debug prints
fixed #425
We handle .tox files (still need actual command line support)
fix compile warning, they are fatal to Qt Creator
Merge pull request #433 from dubslow/master

fix #431, fix export cancels, and more debug prints
fix #436
I learned some things: improve thread safety
Merge branch 'thread' into corencryption
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