v0.2.0-alpha

Initial release with:

• table with elements, losses, adducts, charges and isotopes
• functions to parse formula, ion notations, html and latex notations
• C++ function to search the elemental composition from a mass (using a restricted set of elements or not)
• Full unit test
• Companion functions to calculates masses, ions, deviations

To do:

• Add functions for untargeted search
• Add functions to annotate fragmentation spectra
• Vignettes