Render phopho linkages in glycan structures #89
Description
G:G75715NE contains a phospho linkage
As drawn by the gnome structure browser:
As drawn by the current glycan structure drawing of rustyms:
The best solution I think is to overlay a P directly on the bond in question for the rustyms generated image. Although adding in the P as a separate node could also be done. An important point is that the glycan name parser should be checked to properly parse this class of linkages.