datapacke table names are not allowed to contain "-"

[mwallschlaeger]

When uploading a datapackage.zip inside the containing datapackage.json table names are not allowed to contain "-" like:

      "name": "mpanda_data-set_anonymized_s16",
      "type": "table",
      "path": "Mpanda_Data_set_anonymized_S16.csv",
      "scheme": "file",
      "format": "csv",
      "mediatype": "text/csv",
      "encoding": "utf-8",
      "dialect": {
        "csv": {
          "delimiter": ";"
        }
      },
      "schema": {
        "fields": [
          {

this will lead to following error in execution request response;

"Task: importer.publish_resource raised an error during actions for layer: import: Failed to find layer 'mpanda_data-set_anonymized_s16 on datasource '/mnt/volumes/statics/uploaded/tmpmkdx7jw0/Mpanda_Data_set_anonymized_S16.csv'.. Request: b5359585-597b-47f1-868c-393f51e39e29", 

instead use e.g. underscore:

      "name": "mpanda_data_set_anonymized_s16",
      "type": "table",
      "path": "Mpanda_Data_set_anonymized_S16.csv",
      "scheme": "file",
      "format": "csv",
      "mediatype": "text/csv",
      "encoding": "utf-8",
      "dialect": {
        "csv": {
          "delimiter": ";"
        }
      },
      "schema": {
        "fields": [
          {