tests: modify minirst test input to new format Modifying the test input data shows the effects of the last patches. In text output nothing has changed. In html output the title has moved on its own line.

minirst: do not add a 2nd empty paragraph This does not add a separating block after a separated note directive. .. note:: text is formatted to Note: text

minirst: find admonitions before pruning comments and adding margins Lines with only a directive are not deleted anymore because they are detected before comments are deleted by prunecomments(). addmargins() will be adapted later.