msm_points: Points file

All the tools in UoMASM assume that points are provided in text files in one of the two formats shown below.
The msm_points class encodes a set of points which can be read from/written to a text file in the format shown below.

This is the default format which is written by the tools and library functions:
version: 1
n_points: 4
{
316.069 201.255
410.593 206.549
333.881 320.539
411.389 320.995
}
Note that points in a simpler two column format can also be read in:
4
316.069 201.255
410.593 206.549
333.881 320.539
411.389 320.995
The first line indicates how many points follow.