ADESALT can now bin based on the bins of another .ms file

New function is ADESALT.template_binning
Added code to moment_tests to plot a bunch of lines and models on a grid

Various other updates and bug fixes
Added code to sa.plot_line to allow for baseline subtraction

This uses ADEUTILS.polyclip. Also updated plotz2 in moment_tests to use
this functionality.
ADE_gauss can now accept a previously defined vector of x-axis values
moment_tests.plotz2 now can plot a bunch of sims at once

The result is that the different sim files are overplotted on one another
with a legend to show what the h_zR is for each sim.
Salty2 can now simulate the effects of RSS on simulations

New helper function is observify and is called by line_profile.
Also added some plotting niceties to ADESALT