prepare_project.py, prj definition does not support Southern Hemisphere locations.

[cshuler]

I patched this by changing lines 188 to 193 formerly:

proj4_dic = {}
for item in projlist:
    if (item == '+no_defs') or (item == ''):
        continue
    else:
        proj4_dic[item.split("=")[0]] = item.split("=")[1]

to

proj4_dic = {}
for item in projlist:
    
    if (item == '+no_defs') or (item == ''):
        continue

    elif (item == '+south'):
        proj4_dic["Yshift"] = 10000000.0

    else:
        proj4_dic[item.split("=")[0]] = item.split("=")[1]

Overall thanks for this very useful workflow, I haven't fully gotten it to work for my data yet, but it is very promising. Mahalo!