Get symbols from a character

Compute Jacobian of a function symbolically

1 | ```
jacobianSymb(f, variables = NULL)
``` |

`f` |
named vector of type character, the functions |

`variables` |
other variables, e.g. paramters, f depends on. If variables is
given, f is derived with respect to variables instead of |

named vector of type character with the symbolic derivatives

1 2 | ```
jacobianSymb(c(A="A*B", B="A+B"))
jacobianSymb(c(x="A*B", y="A+B"), c("A", "B"))
``` |

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