The instrument/IDFs_for_UNIT_TESTING directory was renamed to instrument/unit_testing, as it now contains nexus as well as IDF files.
All the paths in the source were changed accordingly.

The SMALLFAKE_example_geometry.hdf5 was moved from the build ExternalData to instrument/unit_testing.

The LOKI_Definition.hdf5,SANS2D_Definition_Tubes.hdf5,WISH_Definition_10Panels.hdf5 files were moved
from the build ExternalData to instrument/unit_testing.

Update copyright headers in all files

Squashed commit of the following:

* First version of a script to manage copyright statements

re #23468

* Neatened up script, added comments

re #23488

* move script to tools directory

re #23488

* small script changes and a couple of manual file changes

re #23488

* Minor chnage to whitespace detection in regex

re #23488

* Add an excluded directory

re #23488

* remove a repeasted copyright statement in a file

re #23488

* Don't comsume the comment end if it is on the same line

re #23488

* fix error in new copright parsing

re #23488

* remove double copyrifght entry

re #23488

* Improve handling of old copyrights at the start of comments

re #23488

* remove empty comments re #23488

* exclude gsoapgenerated directories

re #23488

* Sort out greedy line matching re #23488

* improve empty comment removal

re #23488

* improve false positives

re #23488

* impressive speedup by limiting regex matching length

re #23488

* remove evil invisible non ascii character

Also upadte the copyright at the same time

re #23488

* resolve multiple copyrights in a single file

re #23488

* resolve an issue with new statement detection

re #23488

* another unprintable unicode character

re #23488

* pep updates and cmake the new copyright fit clang format

re #23488

* update already done new format headers

re #23488

* wrong type of bracket

re #23488

* Update class_maker and friends

re #23488

* Update all copyright statements

re #23488

* clang format re #23488

* flake8 warnings re #23488

* Flake8 warnings re #23488

* Exclude .cmake.in and rb.in files

re #23488

* replace missing line re #23488

* exclude .py.in files as they are flasely recognized as C++

re #23488

* another setp.py.in re #23488

* another .py.in correction re #23488

* Hopefully the last of the .py.in files re #23488

* resolve utf-8 encoding of python files and changed ABINS checksum

re #23488

* updates to unit tests that reference line numbers

re #23488

* remaining unit test files and other fixes

re #23488

Was in the wiki as
https://www.mantidproject.org/Individual_Ticket_Testing

Squashed commit of the following:

commit 7430d88e
Author: T Jubb <t.w.jubb@gmail.com>
Date:   Fri Aug 3 14:04:45 2018 +0100

    Refs #0 Revert PR template.

commit bfca2a5a
Merge: b7a9a09b ccc7a67d
Author: T Jubb <t.w.jubb@gmail.com>
Date:   Fri Aug 3 13:59:20 2018 +0100

    Refs #0 merge remote branch.

commit b7a9a09b
Merge: 3abde33d 16e27bdb
Author: T Jubb <t.w.jubb@gmail.com>
Date:   Fri Aug 3 13:55:47 2018 +0100

    Refs #0 merge master.

commit 3abde33d
Author: T Jubb <t.w.jubb@gmail.com>
Date:   Fri Aug 3 13:52:26 2018 +0100

    Refs #0 make changes as per comments.

commit a27f8a1a
Merge: 54684e10 b5ad845b
Author: T Jubb <t.w.jubb@gmail.com>
Date:   Fri Aug 3 13:51:18 2018 +0100

    Refs #0 merge master.

commit ccc7a67d
Merge: 54684e10 b5ad845b
Author: TWJubb <33163693+TWJubb@users.noreply.github.com>
Date:   Fri Aug 3 13:05:49 2018 +0100

    Merge branch 'master' into PyCharmDevDocs

commit 54684e10
Author: T Jubb <t.w.jubb@gmail.com>
Date:   Fri Aug 3 12:57:21 2018 +0100

    Refs #0 : Add PyCharm dev doc page.