#100 image save bugs

[Anonymous]

I've found three problems when saving images with
<ilSaveImage> and <ilSave> with devIL 1.6.8-RC1. All
problems were with 8-bit (256 colours) greyscale
images.
1) BMP files were saved as 24-bit not as 8-bit
2) BMP RLE compression did not work <ilSetInteger
(IL_BMP_RLE,TRUE)> - no difference from normal save
3) TIF files were saved but cannot be opened by any
program

Cheers.

[G. Myers]

I have posted patched to address two of these issues:

For #1 see https://sourceforge.net/tracker/?func=detail&aid=2805446&group_id=4470&atid=304470

For #3 see https://sourceforge.net/tracker/?func=detail&aid=2808424&group_id=4470&atid=304470