#17 Even-odd mode for 2 page display

[Daniel Arbuckle]

The current 2-page display mode displays two adjacent pages with the odd-numbered page on the left and the even-numbered page on the right.

This patch adds a sub-mode that displays the first page alone, and displays later pairs of pages with the even-numbered page on the left and the odd-numbered page on the right.

This is useful for reading e-books that place the "spine" between even and odd pages instead of vice-versa.

This patch is against the released djview4 version 4.3 source.

[Daniel Arbuckle]

Patch for extra 2-page display mode

[Leon Bottou]

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Done.
Changed your code to make it work in continuous mode
and also to interact better with the preferences.
I still lack a pretty icon for this (key F6)