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Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool.  Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience.  Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.

Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices.  It also references version control
history for more precise information.  Therefore we no longer need to spell
out the list of Contributors in each source file notice.

Replace CMake per-source copyright/license notice headers with a short
description of the license and lin...

Each source file has a logical first include file.  Include it in an
isolated block so that tools that sort includes do not move them.

Drop all GetTerseDocumentation and GetFullDocumentation methods from
commands.  The command documentation is now in Help/command/*.rst files.

Delay computation of the command documentation until it is needed.
It is wasteful to do it in the constructor on every call.
Inspired-By: Christian Ehrlicher <Ch.Ehrlicher@gmx.de>

This converts the CMake license to a pure 3-clause OSI-approved BSD
License.  We drop the previous license clause requiring modified
versions to be plainly marked.  We also update the CMake copyright to
cover the full development time range.

"find_file", otherwise the docs talk about find_path() instead of find_file
(patch from  Michael Wild, #9047)

Alex

ENH: Improved support for user-configured search paths.  Paths given in the CMAKE_LIBRARY_PATH cmake variable are searched first, then those in the CMAKE_LIBRARY_PATH environment variable, then those listed in the call to the FIND_LIBRARY command and finally those listed in the PATH environment variable.  The support is similar for finding include files with FIND_PATH, but the variable is CMAKE_INCLUDE_PATH.

ENH: Moved ExpandListVariables out of individual commands.  Argument evaluation rules are now very consistent.  Double quotes can always be used to create exactly one argument, regardless of contents inside.

ENH: Added reference to Copyright.txt.  Removed old reference to ITK copyright.  Changed program name to CMake instead of Insight in source file header.  Also removed tabs.

ENH: change InitialPass to take a const reference to the argument string, to avoid changes to the file cache

ENH: big change, only allow commands access to the cache via the cmMakefile class and GetDefinition, also the cmMakefile is the only way for commands to add to the cache.  Also, some changes to configure.in that check for for scoping