proposed debug logging changes

[jhalliday]

If anyone is making use of FacilityLevel and VisibilityLevel in their logging configuration, or using DebugLevel settings other than 0x00000000 and 0xffffffff, now would be a good time to let me know. I'm of the opinion these options are better off dead and will be removing them shortly if nobody makes a good case to the contrary.

Jonathan.

[marklittle]

I would like to take this opportunity to wish you good luck and remind you that the docs will need updating too

[jhalliday]

Ahh, there are only about 1100 usages spread over 200 files. Besides, I have a cheat mode in the form of Intellij IDEA's structural search and replace.