Adjust scaling factors to avoid righthand/bottom edge conditions
source/ChangeFSI: After rounding up the scaled output size, recalculate the div/mul factors so they produce a whole number of pixels instead of falling off the end of the input array and mixing in black. source/DesktopFE: Remove dead variable "safe%" and change tofitx/tofity to integers. Minor clarification in CmdBasUse documentation. Tested with a 100x100 green sprite, scaled by 5:3/5:3 and 3:7/3:7. Fixes ticket #236. Version 1.59. Tagged as 'ChangeFSI-1_59'
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