Cleaned up log.h; propagated the impacts

log.h declared some values that were local to a single file,
not necessarily log.cpp, and some functions that are no longer
in use.

Cleanup up log.h and then made adjustments.


Compiled:  STD on clang (mac) and STD on gcc (chap01)
Tested:    No change in functionality but built some
           logs with a few flags and checked output
Review:    None




git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@23605 3a8e244f-b0f2-452b-bcba-4c88e055c3ca