tiffcrop: disable incompatibility of -Z, -X, -Y, -z options with any PAGE_MODE_x option (fixes #411, #413 and #426)

tiffcrop does not support -Z, -z, -X and -Y options together with any other PAGE_MODE_x options like -H, -V, -P, -J, -K or –S.

Code analysis:

With the options –Z, -z, -X and -Y the crop.selections are set to a value > 0. Within main(), this triggers the call of processCropSelections(), which copies the sections from the read_buff into seg_buffs[]. In the following code in main(), the only supported step, where that seg_buffs[] are further handled are within an if-clause with if (page.mode == PAGE_MODE_NONE) .

Execution of the else-clause often leads to buffer-overflows.

Therefore, the above option combination is not supported and will be disabled to prevent those buffer-overflows.

This MR solves issues #411 (closed) and #413 (closed), and also #426 (closed).