Added a progress bar

[tjgalvin]

As a quick proof of concept, I added a quick progress bar to provide some indication on the state of aegean as it is fitting. It is fairly straightword using tqdm. An option has been added to either enable or disable this progress bar from appearing. At the moment it is not writing to the logger object -- rather it is just printing to stdout. I am not sure what you would prefer here.

[coveralls]

Coverage increased (+0.004%) to 82.635% when pulling 0493544 on tjgalvin:progressbar into 174c059 on PaulHancock:main.

[PaulHancock]

as a proof of concept I like this a lot. Due to the way that I do the fitting (and re-fitting) within Aegean there are annoying things that need to be addressed before we can have this as a completed solution:

• need to have the progress bar working in the priorized fitting as well as normal fitting routines
• I did some not so smart things when doing a single core fit that kind of break the progress bar as implemented. Eg, when a single core is used this progress bar jumps 0->100% in one step in an instant.

These are both fixable things, and your tqdm solution is a good template for incorporating them.

[PaulHancock]

Your ideas have been incorporated into a different pull request so this one is no longer needed.