More logging

[barneydobson]

Description

• Remove all the chaff in post_processing/synthetic_write (currently just commented - as this may be useful for the eventual refactor in SWMM file writing #16 )
• Link tqdm to verbosity, and maybe the simulation can be tqdmed?
• Print out information about the model (number, bbox, etc)
• When does simulation start/finish
• Things like 'starting iterate_graphfcns' and 'starting iterate_metrics'
• Progress bar for simulation
• Break down logging in larger functions so the bottleneck can be identified (i.e., subcatch calcs) (too excessive for now, especially since pyflwdir massively speeds things up..)
• Maybe an intermediate toggle for things like (e.g.,) printing the graph after each graphfcn (not sure is necessary at this stage)
• I have made a lot of the logger.info/etc inside a check of verbosity is true... this obviously isn't needed since that is handled in the logger.
• Save config file used to model dir
• Add and test parameter validation (... not quite logging.. but... similar?)

Fixes #71

[cheginit]

I added a couple of comments, the rest looks good to me.

[dalonsoa]

I'm approving this as my comments are mostly agreeing with @cheginit ones, so will be fixed at the same time. The custom tqdm definitely needs a review.