ENH: LineParameters alternative constructors

[benoit9126]

In #121, I realized several things that should be done regarding the LineParameters class. Here is a small list of remaining tasks

• In the class method from_geometry, there is a geometric configuration for a twisted line and for an underground line. There is no configuration for overhead line (flag configuration for example). Currently, the overhead is linked to the twisted configuration.
• In the class method from_geometry, some checks should be done:
  • with an underground line, the height parameter should be negative. For overhead and twisted lines, height should be positive
  • when the sections become large, there is some geometric infeasibility because of the d_{ext}/4 constraint (especially in the twisted configuration) => Maybe modify the provided lengths/dimensions to ensure that no impossible configurations can be generated.
• In the class method from_geometry, if no neutral data are provided, maybe consider generating configuration without neutral wire (3x3 matrices). Or take a new "phases" argument to define the number of conductors in the geometric configuration.
• The class method from_name_mv uses the Coiffier's coefficients to generate the impedance and shunt admittance matrices. It needs to be refactor in a more interesting name. The documentation doesn't exist...
• The class method from_name_lv is a wrapper around the from_geometry class method with default values. I think it should be removed.