SANSA 1878 mandatory fields should be mandatory in CKAN

[gubuntu]

At least one field (Acknowledgment) says its mandatory in the tip but does not have a red star. There may be others...

[Mohab25]

removed the text under acknowledgement which is not a mandatory field, add usage field to the schema

@Jeremy-Prior @seabilwe a last round of tests would be great, reopen if there is something wrong

[Jeremy-Prior]

@Mohab25 "Organisation role" is a mandatory field as it should be but does not have a tip:

"Maintainer" is correctly implemented as an optional field as per the SANS 1878 document but the tip says it is mandatory:

"Temporal Reference System Information" is correctly implemented as an optional field but the tip says it is mandatory, I have a suggested change in the screenshot but removing the "This is partly a SANS 1878 mandatory filed" is also fine:

[Jeremy-Prior]

@Mohab25 I'm adding the spelling issues here to as per slack.

• Double dash in "Statement" tip:

• Misspelt 'step' in "Process step rationale":

• Misspelt 'address' in "Processor address - City" field heading:

• Missing point from ellipsis in "Units of distribution" tip:

[Jeremy-Prior]

Changes applied on testing site.