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Errors and warnings from the if() command always display the argument
list given to the command followed by an explanation of the problem.
This moves the argument list into a pre-formatted block and follows it
with a paragraph-form explanation.  The result looks cleaner.

If a logical block terminates with mismatching arguments we previously
failed to remove the function blocker but replayed the commands anyway,
which led to cases in which we failed to report the mismatch (return
shortly after the ending command).  The recent refactoring of function
blocker deletion changed this behavior to produce an error on the ending
line by not blocking the command.  Furthermore, the function blocker
would stay in place and complain at the end of every equal-level block
of the same type.

This teaches CMake to treat the begin/end commands (if/endif, etc.) as
correct and just warns when the arguments mismatch.  The change allows
cases in which CMake 2.6.2 silently ignored a mismatch to run as before
but with a warning.

This centralizes construction of the error message for an unclosed
logical block (if, foreach, etc.).  We record the line at which each
block is opened so it can be reported in the error message.

When a function blocker decides to remove itself we previously removed
it at every return point from the C++ scope in which its removal is
needed.  This teaches function blockers to transfer ownership of
themselves from cmMakefile to an automatic variable for deletion on
return.  Since this removes blockers before they replay their commands,
we no longer need to avoid running blockers on their own commands.

Previously bad arguments to an if() or elseif() would cause some
subsequent statements in the corresponding block to execute.  This
teaches CMake to stop processing commands with a fatal error.  It also
provides context to bad elseif() error messages.

Provide VERSION_LESS, VERSION_EQUAL, and VERSION_GREATER operators in
the if() command.  This simplifies component-wise comparison of version
numbers in the form "major[.minor[.patch[.tweak]]]".

It is useful to be able to test if a target has been created.  Often
targets are created only inside conditions.  Rather than storing the
result of the condition manually for testing by other parts of the
project, it is much easier for the other parts to just test for the
target's existence.  This will also be useful when find-modules start
reporting results with IMPORTED targets and projects want to test if a
certain target is available.

  - This will help projects support multiple CMake versions.
  - In order to set a policy when using a newer CMake but still
    working with an older CMake one may write
      if(POLICY CMP1234)
        cmake_policy(SET CMP1234 NEW)
      endif(POLICY CMP1234)
  - Note that since CMake 2.4 does not have if(POLICY) supporting
    it will also require using "if(COMMAND cmake_policy)"

ENH: make CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS the default and remove the property.  If any value is specified in an endif, endforeach, endwhile, etc then make sure it matches the start string.  If no values are given then it is no longer an error.

ENH: add return and break support to cmake, also change basic command invocation signature to be able to return extra informaiton via the cmExecutionStatus class

BUG: this seems to fix the regexp result-storage problem, now it seems the actual result is tored instead of "1" , as it happened for StringFileTest on Windows

Alex

ENH: also store the group matches from IF( MATCHES) in CMAKE_MATCH_(0..9)

Alex

ENH: add IF(IS_ABSOLUTE path), so no regex matching is required in the cmake scripts

Alex

BUG: All variable accesses should produce watch callbacks, including IF(DEFINED <var>) ones.  Instead we define a new access type for IF(DEFINED) so that the error does not show up for backward compatibility variables.

BUG: It cannot be an error if the values do not convert.  The docs say that if the values do not convert the test is false.

BUG: For LESS, GREATER, and EQUAL check that the arguments can actually be converted to numbers.  Also force the conversion results to be stored in memory to make sure they both use the same precision.  This addresses bug#3966.

ENH: Patch from Alex to provide nicer syntax for FILE_IS_NEWER.  Using name IS_NEWER_THAN so old syntax will continue to work.

ENH: add support for win64 for visual studio 2005 ide and nmake, also fix warnings produced by building for win64