restore the colour 0 ("black") that got broken by extended colours

the colour 0 was broken by the extended colours patch because it needs
an explicit bit check (lower bits will be false since it is 0)

Thanks to lhynes for the report
Merge pull request #110 from ailin-nemui/colour-break

restore the colour 0 ("black") that got broken by extended colours
fix colour 0 again

the previous commit was broken, as it conflicted with the colour
\#000000. Now both the "real colour black" and the "terminal colour 0"
are working.
Merge pull request #111 from ailin-nemui/colour-break

fix colour 0 again
Fix typo in help for network command
Removed the obsolete SQUERY and SERVLIST commands

Removed the obsolete SQUERY and SERVLIST commands.
Syntax rewrite for S-commands

Rewrote the syntax documentation for all commands starting with S.