#15 Add axis -type option

[Marcelo Matus]

This patch adds the -type option to the axis. With
this option you can set/inquire the axis type:
left, right, top, bottom.

So now you can use it like this:

.sc axis configure $axis -type left

which is equivalent to

.sc yaxis use $axis

And also, you can inquire the axis type, or where is
mapped, with

.sc axis configure $axis -type

which will return left, right, top or bottom.

The '-type' option was choosed to do this to resemble
the element -type option.

The option was also added to the fixes axis, for
compatibility,
but maybe it is not neccesary.

Marcelo

[Marcelo Matus]

[Marcelo Matus]

Modified exampl that uses the axis -type option