Reimplement ability to email students from participant list and report

Run included Behat test. Also, try sending email from 1-any number of participants and verify that email gets send out. Environment go to site administration > messaging enable emailbulkmessaging setting Test #1 go to a course enrol some students go to participants select some users use with selected users... menu and choose send an email write a subject and a message check that emails have been sent write a new email and check carbon copy case check that you have received this email too Test #2 go to site administration > users > bulk user actions select some users use with selected users... menu and choose send an email write a subject and a message check that emails have been sent write a new email and check carbon copy case check that you have received this email too Test #3 go to course with activity and students click on Actions menu and click on More... go to "Course participation" report choose an activity select some users use with selected users... menu and choose send an email write a subject and a message check that emails have been sent write a new email and check carbon copy case check that you have received this email too Environment go to site administration > messaging disable emailbulkmessaging setting Test #4 go to a course go to participants select some users use with selected users... menu check that send an email is not in menu Test #5 go to site administration > users > bulk user actions select some users use with selected users... menu check that send an email is not in menu