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Signed-off-by: Jose Borreguero <borreguero@gmail.com>

Signed-off-by: Jose Borreguero <borreguero@gmail.com>

Also updated class_maker.py

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

* improv...

This will contain code commonly used by any part of the code
base that interacts with the Python C api.

Update to clang-format-5 and reformat the codebase 

Refs #22344

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.

Merge done to enable documentation be be fixed, because of removal of
alias directive and addition of related algorithms directive.
Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

re #22143

re #21243

Python 3 requires the GIL for any operations on a dict type.

Transforms the Python error state to a string message of a std::exception
type. Throwing this allows all parts of the framework to catch known
exception type.

Allows for more perfect wrapping of boost::python::call_method without
having to define additional wrappers for more arguments.

The GIL is required for the reference count operations but Python 2 seems
to let you get away with not acquiring it.

Notes:
 - All PyString_AsString are replaced by PyBytes_As_String as the
   bytesobject header exists on all versions > 2.6.
 - Uses of PyLong may not yet be correct in all cases for both
   Python 2 & 3.
 - Attempt to support unicode strings in Python 2 has been added. Needs
   testing

re #15289

re #8840

re #8840