PATCH: extending extend

[Wookey]

+++ John Pybus [04-12-09 16:31 +0000]:
> Hi Olly,
> 
> I've recently been using extend to create extended elevations of OUCC 
> caves and needed something a bit more capable to cope with more complex 
> sections of cave.
> 
> The attached patch provides the ability to switch the direction of 
> extension between left and right, to explicitly specify the start 
> station, and to break the extension at particular stations or legs.  It 
> adds an option to specify a specfile which contains directives in an svx 
> like syntax such as follows:

Well done that man Pybus - this is something that has been on the
would-be-nice list for about a decade.

Wookey
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