Core collapse supernovae

[chaitanyaafle]

This patch adds the core-collapse waveform model:

1. Added core bounce and post bounce waveform for core collapse supernovae. This uses a .hdf file containing principal component basis vectors to generate the waveforms. The principal components are generated using singular value decomposition of a catalog of numerical simulations. The waveform model is h = a_1 * x_1 + a_2 * x_2 + ... + a_n * x_n, where x_i are the principal component basis vectors and a_i are their coefficients.

2. Added a constraint for the coefficients of the basis vectors that generate the core collapse waveform. The coefficients should be inside the two/three dimensional convex hull of the coefficients of the waveforms in a catalog.

3. For Bayesian inference, the coefficients are the variable parameters while the principal components and the number of principal components used are static parameters. Following is an example section of .ini file that would be used for inference:

[variable_params]
coeff_0 = 
coeff_1 = 
coeff_2 = 
coeff_3 = 

[static_params]
distance = 0.0081
no_of_pcs = 9
principal_components_file = /path/to/principal_components_file.hdf 

[constraint-hull]
name = supernovae_convex_hull
principal_components_file = ${static_params|principal_components_file}
hull_dimention = 3
constraint_arg =

[cdcapano]

Thanks @chaitanyaafle . I have a few requests. Also, please address the PEP-8 issues picked up by code climate.

[cdcapano]

Looks good, thanks @chaitanyaafle