update hyperparameters and install script

[foolnotion]

Hi,

This PR contains our hyper-parameters and a small update to the install script. The parameter time_limit takes a value in seconds (in case you need to change it).

You can get build information from the python module:

>>> import operon
>>> print(operon.Version())
operon rev. c537a45 Release Linux-5.11.14 x86_64, timestamp 2021-04-23T19:45:03Z
single-precision build using eigen 3.3.9, ceres 2.0.0, tbb 2020.2, pybind11 2.6.1

Best, Bogdan