added str_lreplace()

Replaces last occurance in a string.
Chromo snippet update

Updated with the ability to colourise images using the chromo colour
scale.
Parameter handling

Updated and new parameter handling.
More Pagination bug fixes.
Permissions changed.
Space. Wanna go to space.
chromo_image() should return image even when not processed.
Meta data added and spelling corrections.
Prepended home url to og:image
Cleaned up a little.
config update.
New post.