Admin panel: structured log

The log of the project upload should be structured, and the reported errors should be grouped into (preferably in this order):

• Missing information about the project (no disease, no organism, no description)
• Elements missing required annotations
• Reactions missing required annotations
• Elements wrongly annotated
• Reactions wrongly annotated
• Elements not annotated
• Reactions not annotated
• Invalid MIRIAM uri
• Cannot find information for element
• Ignored
• Other

The "Other" category may be further reorganized, as I'm not having an exhaustive list of all possible errors and warnings.