Smodels

Changes:

* introduced (user-defined) combinations of analyses
* changed expected limits computed with pyhf from post-fit to pre-fit
* notion of "nonaggregated" databases introduced
* small fixes

Changes:
* caching weight matrix in simplified likelihoods
* notion of "debug" databases introduced
* introduced reportAllSRs option
* tiny fix in mybinder link (see https://pypi.org/project/smodels/)
* small fixes in unit tests
* improved truncated Gaussians in likelihoodsFromLimits (but kept as experimental feature)
* experimental features can now be turned on via ini file

Major novelties include:
* Ability to merge databases using '+' as a delimiter
* slightly extended output of summary printer
* added scan summary (summary.txt) when running over multiple files
* added option to slha-printer (expandedOutput)
* improved interactive plots
* small changes in the printers, L_max and L_SM added

See the [what's new](https://smodels.readthedocs.io/en/latest/ReleaseUpdate.html) for more details

*This version is only compatible with the database version 2.0 and later.*

Major novelties include:
* support for width-dependent results
* introduction of particle class
* introduction of model class

See the [what's new](https://smodels.readthedocs.io/en/latest/ReleaseUpdate.html) for more details

*This version is only compatible with the database version 2.0 and later.*