v1.1.0

Use gonum instead of GSL for finding the optimal calibration parameters. mzRecal in now 100% Go code. Previous versions used the GSL library, which made the code significantly more complex and required cgo to build. This is now solved. In general, the new version generates slightly better recalibration results compared to previous versions.
Added preliminary support for recalibration of mzML files that contain profile spectra. This does not work well yet, since no proper peak picking is implemented.