wmakeCollect: Experimental scheduler for wmake to speed-up parallel compilations

wmakeCollect collects the compilation commands for the all of the object
files to be compiled into a single makefile which is passed to make to
schedule the compilations in parallel efficiently.

Before wmakeCollect can be called the lnInclude directories must be
up-to-date and after wmakeCollect the linkage stage of the compilation
must executed using wmake.

This entire process is now handled by wmake using the new '-queue' or
'-q' option to compile sections of the OpenFOAM source tree or the
entire tree efficiently.  The number of cores the compilation executes
on may be specified either using the WM_NCOMPPROCS variable or the '-j'
option.

To efficiently compile OpenFOAM after a 'git pull' the '-update' option
is provided which updates lnInclude directories, dep files and removes
deprecated files and directories.  This option may be used with '-q':

    wmake -q -update