This is a maintenance update to exrTrader.

Changes since V1.6a:

• Flipping a single channel now occurs before the processing options for a buffer to ease working with RSMB
• Fixed a crash when saving normal images with alpha but the alpha channels wasn't actually activated by the user
• If LW is rendering stereo frames but the %eye% variable is not used then exrTrader will add _L or _R to the frame name just before the frame number
• Fixed a cross platform issue when subdirectories where explicitly defined in the output file. The slashes are now converted depending on the host platform
• Fixed a rare crash when no alpha was selected for saving