DEB_out. General tidy of DEB_out code replacing DebStream::Impl with new DebFile class. Added DEB_ON enabling macro definition to Cmakelists.txt (currently defined in both Release and Debug builds). Added DEB_module() and some four-letter module declarations. Added call stack based hyperlinks and pop-up texts for HTML deb out. Added new DebUtils.hh header

The only change to IGM and CoMISo code in this CL is addition of DEB_module() statements.

[git-p4: depot-paths = "//ReForm/ReForm/main/Base/": change = 10466]

DEBUG. Increased build warning level to \W4. Added some missing linefeeds to new DEB_out streaming. Raised level of TRACE_GUROBI_INPUT deb out to 7 and decerased default DEB_out level to 5 so as to redisable this output by default.
 No behaviour changes anticipated other than changed DEB_out content.

[git-p4: depot-paths = "//ReForm/ReForm/main/Base/": change = 10448]

DEBUG. Added new Base project currently conmtaininging just DebOut.hh and DebStream.cc implementing DEB_enter_func, DEB_out, DEB_warning, and DEB_error (together with _if varients) and replaced a large number (not all) of std::cerr and std::cout measage streaming with DEB_out, DEB+warning, or DEB_error as appropriate, All such text is currently piped to std::cerr in both Release and Debug builds, but this will probably be changed in a future CL.

[git-p4: depot-paths = "//ReForm/ReForm/main/Base/": change = 10440]