colourise 6.x-1.3

There is no new features in this release yet, but improved / fixed various code and files.

#337294: create content options overlap Fixed Fieldsets overlap in IE6/7 (Reported by coffmx).
#337340: Nested lists Corrected indented nested lists (Reported by fourteen40).

# Separated CSS files and added new icons.
# Overrode CSS code for some core modules.
# User picture supported both in node and comment.
# Improved legiblily and typography.
# Cleaned up and rearranged files and folders.