"tck" parameter

[Ross Ihaka]

I have been making some changes to the axis drawing code which will
allow users to use par(tck=...) to produce grid lines and tick marks
which go into a plot rather than pointing outwards.

I don't particularly like the strategy that S uses for determining
tick mark size so I have introduces an alternative mechanism as well.
There is now a new "par" parameter called "tcl" (appologies to John
Ousterhout for this) which lets a user specify the tick length as
a fraction of the height of a standard sized line.

The default is to use par(tcl=-0.5) which gives the present look.

I don't like introducing a new "par" value, but there seems to be
no other way to resolve the fixed vs variable-sized tick mark needs.
If anyone has a better solution, I'd be happy to consider it.
	Ross
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