Changed SD filename generation, made SD handling more reliable as a whole
Properly restart sd prints

Fixes #258
(cherry picked from commit 076c676)
Unbind old click handlers from confirmation dialog before use.

Fixes #279
Make swallowOkAfterResend default to True, part of the fix for #166
SwallowOkAfterResend isn't repetier only anymore
Removed obsolete GcodeLoader in printer module
Preparing official "release" of a first rc to help in packaging
Fixed #296
(cherry picked from commit fdfa433)
Properly calculate time deltas (forgot the days)

Fixes #313