Basic ogc wkt parsing into crsobj works.

Next:
- Comb through to smooth out kinks, like how to handle default values
such as datum (not always needed) or unit when not specified (on parsing
or on outputting). Or handling basic lat long crs without proj. Adding
wkt axis parsing. Cleaning messy wkt parsing maybe.
- And finally add esri wkt, copy paste mostly, but some small
differences.

pycrs/parameters.py

@@ -163,6 +163,7 @@ class ProjCS:
         self.geogcs = geogcs
         self.proj = proj
         self.params = params
+        self.unit = unit
         if twin_ax == None:
             # default axes
             twin_ax = directions.East(), directions.North()
@@ -171,6 +172,7 @@ class ProjCS:
     def to_proj4(self):
         string = "%s %s " % (self.proj.to_proj4(), self.geogcs.to_proj4())
         string += " ".join(param.to_proj4() for param in self.params)
+        string += " %s" % self.unit.to_proj4()
         # in proj4, axis only applies to the cs, ie the projcs (not the geogcs, where wkt can specify with axis)
         string += " +axis=" + self.twin_ax[0].proj4 + self.twin_ax[1].proj4 + "u" # up set as default because only proj4 can set it I think...
         return string
@@ -178,6 +180,7 @@ class ProjCS:
     def to_ogc_wkt(self):
         string = 'PROJCS["%s", %s, %s, ' % (self.name, self.geogcs.to_ogc_wkt(), self.proj.to_ogc_wkt() )
         string += ", ".join(param.to_ogc_wkt() for param in self.params)
+        string += ', %s' % self.unit.to_ogc_wkt()
         string += ', AXIS["X", %s], AXIS["Y", %s]]' % (self.twin_ax[0].ogc_wkt, self.twin_ax[1].ogc_wkt )
         return string
     
@@ -356,10 +359,10 @@ class DatumShift:
         self.value = value
 
     def to_proj4(self):
-        return "+towgs84=%s" %",".join((str(val) for val in self.value))
+        return "+towgs84=%s" %",".join((bytes(val) for val in self.value))
 
     def to_ogc_wkt(self):
-        return "TOWGS84[%s]" %",".join((str(val) for val in self.value))
+        return "TOWGS84[%s]" %",".join((bytes(val) for val in self.value))
 
     def to_esri_wkt(self):
         raise Exception("Paramater not supported by ESRI WKT")
@@ -374,7 +377,7 @@ class MeterMultiplier:
 
     def to_ogc_wkt(self):
         # the stuff that comes after UNITS["meter", ... # must be combined with unittype in a unit class to make wkt
-        return str(self.value)
+        return bytes(self.value)
 
     def to_esri_wkt(self):
         return self.to_ogc_wkt()
@@ -394,7 +397,7 @@ class UnitType:
 
     def to_ogc_wkt(self):
         # the stuff that comes after UNITS[... # must be combined with metermultiplier in a unit class to make wkt
-        return str(self.value.ogc_wkt)
+        return bytes(self.value.ogc_wkt)
 
     def to_esri_wkt(self):
         return self.to_ogc_wkt()