GitLab

Update to Symbolics 3

This requires using the safer symbolic variable definition via interpolation.

simplify stoichiometry_matrix API & make it more efficient

Fix definition of units

The exponent applies to the multiplier as well.  Reorganize the `get_unit`
function to make it clearer what's the formula used.

Make `sbml` slightly more type-stable

`Libdl.dlsym` can return `Union{Nothing, Ptr{Nothing}}`.  We know that the
symbols we use exist, and even if they didn't this change makes the function
fail early instead of calling a `NULL` function in the shared library 💥

separate reactants and product stoichiometries

rational mathval

closes #119

closes #140

docstringextensions

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.