More consistant Vec3D from command line

[SAnsell]

Introduction

There are a number of places that CombLayer accepts Vec3D points and axes from the command line. Examples include
adding a point tally [-T point free Vec3D(1,2,3) ] or adding an implicit Vec3D e.g source point with [-sdefType point / -sdefObj ObjectName LinkPt].

This is highly inconsistent in naming, method and generalization, and involves significant repeated code ideas if not exact repeats.

Purpose

The objective is to clean this up and provide a single interface and consistent way of specifying all of this.

Proposal / Implementation

In files inputParam.h and inputParamSupport.cxx , functions

Geometry::Vec3D getNamedPoint(const Simulation&,const inputParam& IParam,
	       const std::string& keyItem, const size_t setIndex,
	      const size_t index,const std::string& errStr);

Geometry::Vec3D
getNamedAxis(const Simulation& System,const inputParam& IParam,
	      const std::string& keyItem,const size_t setIndex,
	      const size_t index,const std::string& errStr)

These two functions basically can use the Simulation instance to generate points based on FixedComp units or PointMap/SurfMap units.

Currently the possible ways to specify a general point:

• Vec3D(x,y,z)
  

• FixedCompName:LinkPt
  

• PointMapName:Name:Index
  

In the last case, the PointMap can have an optional additional index because multiple points can have a same name as a group. If the index is not given then the first point is the default [specified as 0].
The values in the function are

• System :: Standard simulation object
• IParam :: input stream from the command line
• keyItem :: name of primary flag in the input stream (e.g. the part with - or -- infront of it)
• setIndex :: which repeat of the keyItem (starting at 0) to use (e.g. if there are multiple tallies for example)
• index :: the start of the variable point in the secondary components in the main field (e.g. -T point Vec3D(x,y,z) woud set index to 1 as if set to zero then we would process "point"
• errStr :: Error string to write to place into a throw, if the process fails

Axis / directions are similar (and normalized) and take

• Vec3D(x,y,z)
• FixedCompName:LinkPt [signed]
• SurfMapName:Name:Index

Changes to input

-T point XXX is followed by objOffset / object / offset

This doesnt need to make sense so now we are going with
-T point Vec3DUnit {offset}.