Eliminate the use of TOPAZ_900.nxs in unit tests

[Russell Taylor]

This is part of the drive to reduce the size of our subversion repository and elimate the reading of data files in unit tests unless absolutely necessary.

At 27MB, TOPAZ_900.nxs is the eighth largest file currently used in unit tests.

Their use features in:

• LoadInstrumentFromSNSNexusTest
• LoadLogsFromSNSNexusTest
• LoadSNSNexusTest

Tests that have to load a file (i.e. those testing file loading algorithms) should switch to using a much smaller file. Others should create fictional data by using routines like WorkspaceCreationHelper.hh. If an algorithm under test requires the instrument geometry in any way then you may have to wait for completion of ticket #1899.

[Nick Draper]

Bulk move of tickets to iteration 27, if your ticket is essential for Iteration 26 then move it back.

[Vickie Lynch]

(In [8715]) Refs #1915 Changed TOPAZ_900 to CNCS_7860 to eliminate large NeXus file

[Vickie Lynch]

(In [8716]) Refs #1915 Changed TOPAZ_900 to CNCS_7860 to eliminate large NeXus file

[Vickie Lynch]

(In [8717]) Refs #1915 Delete TOPAZ_900.nxs stored twice since no longer needed for tests

[Michael Whitty]

successfully removed from unit tests

[Stuart Campbell]

This ticket has been transferred to github issue ​2762