ENH: avoid divide by zero, temporary fix until cygwin cpu file is read better, bad cpu info is better than a crash

BUG:Fixed NumberOfLogicalCPU, NumberOfPhysicalCPU and LogicalProcessorsPerPhysical under Linux. Some part was just wrong. Some other part missed to take the multicore value into account.

  - Add an argument to registry read/write/delete methods to specify
    a 32-bit or 64-bit view.
  - Default is the bit-ness of the running program.
  - See issue #7095.

  - Tells CMake about the KWSYS_HEADER macro.
  - Enables implicit dependencies of private source files.
  - When a CMake new enough to support the property is required
    the "#if 0" hack can be removed from the source files.

  - Patch from Pierre Habouzit

ENH: all ctype function have the same issue: char can be signed or unsigned, since isspace only deal with >=0 value (except EOF) one has to first cast it to unsigned char

COMP: sprintf warnings. DWORD should use %ld rather than %d. Also, const char *p, a shadowed variable warning.

  - Remove two unused variables.
  - Replace dynamically allocated array with static.

BUG: Fix kwsysSystem_Shell_GetArgumentForWindows to reset the windows trailing backslash count to zero when a make variable reference is encountered.

ENH: Set CMake Policy CMP0003 to NEW behavior to build without warnings with the upcoming CMake 2.6 release.

COMP: Avoid warning in kwsys IOStream.cxx when the helper functions are not needed.  Define one public symbol to avoid complaints from archivers about empty object files.