Add erlang:system_monitor(Pid,[{long_schedule,Millis}])
Add long_schedule detection for ports and testcases
Add documentation for new system_monitor
Skip testcase on platforms w/o pipes/usleep
Merge branch 'pan/monitor_long_schedule' into maint-r15

* pan/monitor_long_schedule:
  Skip testcase on platforms w/o pipes/usleep
  Add documentation for new system_monitor
  Add long_schedule detection for ports and testcases
  Add erlang:system_monitor(Pid,[{long_schedule,Millis}])
Prepare release
Fix an inconsistent state in epp

When entering a new file, epp doesn't properly set #epp.name2 like it
does on initialisation, generating a malformed file attribute when it
leaves the file.
Merge branch 'maint-r15' into maint-r16
Merge branch 'maint-r16' into maint
Merge branch 'nox/fix-epp-file-attrs/OTP-11079' into maint

* nox/fix-epp-file-attrs/OTP-11079:
  Fix an inconsistent state in epp
Update primary bootstrap