Check for v2 Python API in systemtests setup.

Refs #7607
refs #7228 Modified to reflect the changes to performance analysis
refs #7228 System tests: correct options in peak finding
Re #7975 modify system test for transmission fix
Re #7975 modify system test for transmission fix
Re #7975 add ref data for correct frame
CoverageTest for Loading ISIS Event data

There is not ISIS Event data in the Mantid repository. So, this SystemTest
was added to cover specific parts of the algorithm LoadEventNexus that
apply to ISIS data.

re #7985
Lower tolerance for HYSPEC system test to 1e-8. refs #7952
Re #7975 Turn off instr. conf. in test
Merge remote-tracking branch 'origin/feature/7975_eqsans_transmission_fix'
System test for validating grouping files against schema
System test for validating grouping files against schema refs #7712
Merge remote-tracking branch 'origin/feature/7712_system_test_for_groupingworkspace'
Merge remote branch 'origin/feature/7607_remove_v1_python_api'
Merge remote-tracking branch 'origin/feature/7952_systemtests_TIB_events'
Add Vesuvio fit test for when Kfse is free parameter.

Refs #7492
Merge remote-tracking branch 'origin/feature/7985_loadisisevent_coverage'
Re #7777. Remove full path to bl6_flux_at_sample file.

This leads to the one in the system tests repository being found and
will mean that the test will run on rhel6_tester.sns.gov
Refs #5421 Updating system tests.
Merge remote branch 'origin/feature/7228_ConverToMDPerformance'