First implementation of 1D radial case. Only charged particles taked

into account (as in 1D Cartesian case).

The 1D Cathode example case has been modified, having now 2 input files:
  - inputCart.json: Used for Cartesian coordinates
  - inputRad.json:  Used for Radial coordinates

Pusher is a Boris pusher but without z direction.

runs/1D_Cathode/input.json

@@ -1,46 +0,0 @@
-
-{
-  "output": {
-    "path": "./runs/1D_Cathode/",
-    "triggerOutput": 100,
-    "cpuTime": false,
-    "numColl": false,
-    "EMField": true
-  },
-  "reference": {
-    "density": 1.0e16,
-    "mass": 9.109e-31,
-    "temperature": 2500.0
-  },
-  "geometry": {
-    "type":     "1DCart",
-    "meshType": "gmsh",
-      "meshFile": "mesh.msh"
-  },
-  "species": [
-    {"name": "Electron", "type": "charged", "mass": 9.109e-31, "charge":-1.0, "weight": 1.0e1}
-  ],
-  "boundary": [ 
-    {"name": "Cathode",  "type": "absorption", "physicalSurface": 1},
-    {"name": "Infinite", "type": "absorption", "physicalSurface": 2}
-  ],
-  "boundaryEM": [
-    {"name": "Cathode",  "type": "dirichlet", "potential":    0.0, "physicalSurface": 1},
-    {"name": "Infinite", "type": "dirichlet", "potential":  100.0, "physicalSurface": 2}
-  ],
-  "inject": [
-    {"name": "Cathode Electron", "species": "Electron", "flow":  9.0e-5, "units": "A", "v": 27500.0, "T": [2500.0, 2500.0, 2500.0],
-                                 "velDist": ["Delta", "Maxwellian", "Maxwellian"],     "n": [ 1, 0, 0], "physicalSurface": 1}
-  ],
-  "case": {
-    "tau":  [1.0e-11],
-    "time": 1.0e-6,
-    "pusher": ["1DCartCharged"],
-    "EMSolver": "Electrostatic"
-  },
-  "parallel": {
-    "OpenMP":{
-      "nThreads": 1
-    }
-  }
-}