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support for logical operators

Closes #133

version bump to 0.6.0

Rename some functions to something easier understand

Add function to read SBML model from a string

Always pass `report_severities` argument to `check_errors`

fix parsing of relational operators

Fix checking of errors in `libsbml_convert`

fixes #124

* `getS` -> `stoichiometry_matrix`
* `getLBs`, `getUBs` -> `flux_bounds`
* `getOCs` -> `flux_objective`

The function
[`SBMLDocument_convert`](http://sbml.org/Software/libSBML/5.18.0/docs/formatted/c-api/class_s_b_m_l_document__t.html#a96677d1b2225c23f3b3ab662a4e547e2)
returns 0 when it is successful, other numbers otherwise.

Rename `SBMLVersion` -> `Version` and unexport it

Use `Unitful` for units, instead of a custom struct

This should hopefully be slightly more future-proof, as long as libsbml doesn't
change the strings.

handle SBML error severities (and don't throw on warnings)

fixes terminal flood on many existing models

Allow rescue in very deep failure with hOSU and extensive math

closes #117

quickfix: do not break stoichiometry if 2 species references are present

fix argument order and count for piecewise function

Oh my, like, this is the 5th implementation of ifelse we have here?