divvy dev suggestions

[nsheff]

As I was fixing a divvy bug with template paths, I came up with these two suggestions to improve developer experience on divvy code

• def templates_folder(self): - should be deprecated, since we actually specify the path within the divcfg; so this is never used!
• def write(self, filename=None): -- should be renamed to write_config? It's confusing because this is not writing the script, which is done by write_script, even though there is a divvy write. In other words, divvy write calls write_script, not write, which is non-parallel.