- support use of wmake -show-xyz, as well as older WM_CC, WM_CFLAGS etc.
- add support for Makefile.inc for scotch
- add -toolset= option for making boost and use b2 instead of legacy
bjam for configuration
- add internal WM_SIZE_OPTIONS variable for reduced typing
- check for wmkdepend and wmkdep for wmake builds
- avoid egrep for getting processor count.